I think that depends on the dino’s stats and the rest of the kit. One could say the move superior vulnerability is OP, but on a creature such as carbonemys it won’t be broken. Now, if Dioraja had it, then it would be very broken. I think having multiple effects is okay as long as the creature can be countered by some creatures. In the case of Indo gen 2, the fact that is has only 2 attacking moves balances it a bit, but in the case of it being too OP it can be solved without changing the signature move by just nerfing the HP enough that it has a reasonable number of counters. I really like the fact that moves like that are being introduced, they are fun, so I rather the rebalancing is done by stats than by changing a cool move.