I posit that Shocktopus has a Merfolk pilot, just as Deep Borer has a Dwarf pilot and Goblin Rocket has a Goblin pilot.
Dracos 1337 does appear to be an exception, but nevertheless:
Carnex is a Mech in the shape of a monster - no dual type
Clockwork Sphinx is a Mech in the shape of a specific monster - no dual type
I don’t think there’s a strong argument from precedent either way.