This is really tough, but you have some things on your side.
I'm going to start with the same water phase diagram as the other guy, but I added a line to it for a question about Uranus I posted a while back. That line is based on an uncertain source about the pressure vs. temperature on Uranus, but it should illustrate that a real planet might contain liquid-water conditions that extend to substantial pressures and temperatures. Your octopi don't have to burrow into ice, but they do have to contend with extremely hot temperatures as they go down (which shouldn't really surprise us, considering where those cracks are!)
Now there's a lot to fudge with that line - water is heavier than hydrogen, so the pressure should build up faster than it does on Uranus; water has a large heat capacity; it could move heat by convection faster. Maybe your planet has super-thick crust in large part because the water fissures are cooling it to a much deeper depth than Earth. You can blame the tendency to fracture deeply on some aspect of the geological composition of the planet (which is even further beyond my competence than the rest of this). We'll just say somehow the line stays on the green as we go down your fissure.
Now we're cooking squid in a pressure cooker, and our expectation is for cooked meat. But this planet has had a while for evolution to do its magic, and we can at least find some contrary tendencies - the same tendencies that keep the water liquid. On one hand, every atom and molecule in the squid is getting shaken up with an amount of energy proportional to the kelvin temperature. On the other hand, the pressure favors molecules sticking together. Under the ideal gas law, every molecule takes up the same amount of space, but tying two together reduces that by half. So you can get the same amount of energy out of tying two molecules together as if you had bled that volume of gas out through a hole into a vacuum. Put together, you can argue that an ammonia or CO2 molecule that might have just flown off a heated protein, will instead be forced to remain in place.
That's helpful, but not nearly helpful enough. You still have plenty of situations like trans fats. The place we're going has temperatures and pressures comparable to those used in the chemical manufacture of "partially hydrogenated vegetable oils", a bright idea that has killed about 500,000 people a year for a very long time now, because a fat with a cis double bond isn't the same as one with a trans double bond, and the heat can twiddle one to the other. You can imagine there are many, many ways to shake up a biomolecule that doesn't disperse it into small bits of gas, and those are still likely to occur to your squid.
So? We evolve it. Molecule by molecule, all the weak links have to go. Everything has to be buttressed up and made sturdy. This may seem quite impossible, but bear in mind that there are bacteria known that can survive autoclave conditions (that's only 394 K, but it's a start). Hydrothermal vents in Earth trenches are not lacking for life. So we're going to have to handwave - a lot - and say that there's been a massive change in the overall biochemistry of this squid, to allow survival under much higher pressures and temperatures. I don't think it's impossible but I don't know how to do that either! I doubt anybody knows how to draw an ecosystem for a very different planet than ours.
At 32GPa I should also note that you're getting into the boundary of ice and supercritical fluid. I don't think that's a tremendously big deal - there are kinds and kinds of supercritical fluid, and while it is in some sense it's the same as a supercritical gas, it's not entirely gaslike in properties. But at the end your octopus might be doing something closer to falling, perhaps with a need to pay attention to updrafts, in a way that was not as true at lesser depths. Try to stay on the right side of the Fisher-Widom line at least.
The hardest part is probably the journey. You need the same squid to be able to survive the sunlit shallow sea, the freezing depths, and a super-pressure cooker in an oven set to self clean. This isn't something that Earth life is terribly good at - many of our deep sea organisms die immediately upon retrieval to the surface. You may need something very remarkable, such as a symbiosis between two different kinds of life that regard themselves as "the same organism" and share a genetic code and mechanism of memory, in order to pull this off.