I definitely see what you’re saying. In September I personally watched Jenson Brooksby give him a first set breadstick and stick with him from the baseline for a full two hours on Ashe, using the exact strategy. Depth, excellent court coverage, and consistent hitting is going to trouble anyone - Djokovic himself is testament to this archetype being a successful strategy.
flat hitting as well has always annoyed Novak, which may be even more important here - even long before his decline in years like ‘15-16, RBA and Simon did trouble him. He’s never been a Federer/DelPo who can just hit through players, he’s always lacked an elite serve+1 and putaway FH.
Now, the obvious corollary is that you need to take care of your own serve well and that was ultimately Gilles’ downfall. And Novak will change up his style and dictate, and eventually take your legs (as he did to Brooksby and later, Sinner) so it must be said that its quite a physical and mental feat to pull this off successfully.
That being said it’s plainly obvious that he is not what he used to be and players who actually have the belief, physical conditioning, and consistency to stick with him for 4 hours from the baseline have a big chance at winning.