Short answer, probably yes.
Knowledge of materials
If appropriate ores are available, metallic objects tend to be much more durable than wood and stone. Similarly if silica and an appropriately potent fuel source is available, glass can be made. Semiconductors could be made, though transistors might be a stretch (for materials see http://www.radio-electronics.com/info/data/semicond/semiconductor/semiconductor-materials-types-list.php).
Glass may be more durable or sharper than some types of stone. Transparent glass in the form of lenses would take skill most people don't have. Perhaps the Lightspeed neurotransmission would allow the inhabitants to make them once they have been taught the principle.
Semiconductors / Electronics
Diodes would probably be the easiest useful semiconductors. With a suction mechanism a vacuum tube would be easier and require less exotic materials; still something conductive and very heat resistant, like tungsten, would be required. http://www.vacuumtubes.net/How_Vacuum_Tubes_Work.htm
Knowledge of electromagnetism/radio
It could be possible to detect the biological radio using little more than a long, preferably flexible, conductor like a wire and one diode made with semiconductor material. Without an amplified power source speaker or light the detector might be able to almost imperceptibly vibrate iron dust or something like that. To block, or amplify, the biological radio would take more parts for a transmitter; and not all theoretical physicist would have the electronic background necessary to understand how to construct radio transmitters. If either of them had an amateur-radio hobby (Ham https://en.wikipedia.org/wiki/Amateur_radio) this would likely be possible given enough flexible conductor and semiconductor material; though understanding of how to make a transistor or a vacuum tube would be necessary which hams don't usually know. An old theoretical physicists ham radio operator is plausible.
Refrigeration They may have intimate understanding of refrigeration. It has been used extensively for a long time in physics research. Refrigeration may be possible if appropriately shaped (probably metal) objects can be created; if more complicated distillation tools can be made with glass or metal tubing and variable temperature heat refrigerator sources then ammonia could be extracted from urine to make extreme refrigeration.
Distillation is a well known principle that may be useful, for concentration of poisons for example.
Knowledge of Mathematics and Classic Physics
With light-speed neurotransmission knowledge of principles of mathematics could be very useful, depending on working memory. Complicated math could be done very quickly. Teaching math and physics to produce large projectile weapons and understanding other simple machines (leaver, ramp, pendulum etc. see https://en.wikipedia.org/wiki/Simple_machine) would be obvious things to give. Once math and physics have been taught to one or more then they could be used as walking computers to work out details of construction of such things.