No. They're using the same gameplay code as the original Starcraft:
Q: How did you go about replicating all the unexpected “bugs” that made BW micro
so special? Did you simply reuse code from the original game, or did you find a
solution to replicate the nuances of BW’s gameplay?
A: StarCraft: Remastered is able to achieve this effect as it uses all the same
gameplay code as Brood War. This means that Dragoons and Goliaths are still a
bit derpy in how they react to movement commands. The Reaver’s shot doesn’t
always find a target. Mutas stack.
The fact is that the gameplay is identical enough that old replays from 1.16
will play and work just fine under StarCraft: Remastered.