I mean, yes, obviously? Any tool, even if it had near-zero marginal utility must necessarily improve performance, as you can simply elect not to use it.
The disagreement is not in the direction, it's in the magnitude. Therefore the real test is: "Can an average programmer solve AoC faster with GPT4 and without syntax coloring or with syntax coloring and without GPT4?", or "GPT4 in C versus no-GPT4 in Python", or "GPT4 on a crappy laptop vs no-GPT4 on a high-end workstation" and so on.