commentators tangentially referenced this when they mentioned that lyles had "learned" how to make a good finishing lunge, but it was also heavily implied that they were talking about the timing of the lunge and not the mechanics.
So I can't imagine a human can take a conscious step to get a FIVE millisecond advantage over another.
In reality the gun is usually on the inside of the track, so it would be Lyles overcoming this (negligible) advantage.
Tbh, it's all just bullshit to me. Less than 20 years ago, this would have been an ex-aequo, and glorifying someone who happened to dive 5-milliseconds-better is just sad. The obsession with "having a winner", for the benefit of sponsors and image contracts, has taken sports in some ridiculous places.