In Halo, there are large mechanized suits called Mantises. These are heavily armed and bipedal (kind of like the the AT-ST). There is no doubt that they can be built, but why would they? What would the advantages be of a bipedal mech suit?
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The page you linked says that they're about 5.7 meters (18.8 feet) tall. My immediate thought is that this height advantage should be used. The operator of the drone would need to use it to face enemies that are pretty big.
A human - even a heavily armed one - would have problems taking one of these enemies down. A mech suit would have it easier.
Mech suites are great, but bipeds are a bit iffy
Three reasons why:
The number one answer is they would be super cool especially in animation.
Another reason would be fast movement over unpaved terrain. Obviously, our tech is not there but if you wanted to get up and over bombed out buildings and what not being able to climb over them would be a boon. A better design for this would include hands or be a goat-bot. If the desire was to Run Ostrich style across broken roads guns a blazing the mech shown could be a solution.
But looking cool would be the best reason.