I'm aware, I just think he's more mature and stronger with his hold up play. It has been like that for a few years to be fair, I remember a brilliant performance away to City where he held everything up and occupied the centre backs. It's just impressive he does it with little football and it continues to stay sharp and maybe even get better at it. I think some of it comes from being a little stronger too, there's no doubt his build has changed over the years.
His hold up play looks better when the team plays to his strength by getting the ball to his feet. ETH style fit Martial's natural skillset perfectly. However, for different kind of hold up play, like battling for hoofball, or anticipating a 50/50 loose ball and shoulder his marker off balance with strength in the process, Martial would still look average compared to the like of Benzema.
His top level talent/potential is very obvious. That's never in doubt. It's not rare for these elite talent to retain their natural technical ability even after lengthy injury. RvP for example. Despite his injury, he's so good at his stuffs that other players in top shape would never match the level of technique he possessed.
So in my view I don't believe he's getting better, or stay sharp. In contrary, he's still far away from his best version like the restart period. It's more about us getting conditioned with subpar CF play by someone like Ronaldo (never truly nail that CF role without a water carrier), Rashford and Weghorst.