He has been pretty open about not being able to train for some time and other challenges he's had in his personal life so I'd bet a lot of this is just due to that.
That said, he will be turning 45 in 2022 and for many of these guys this is the age where things really start to deteriorate and that always seems especially true with the "big guys". Further, you can't help but wonder (with all the current happenings) what kind of toll this is takin on his health. Of course, maybe we shouldn't ponder that, or even care, but for these guys who are rocking 300lbs in their mid 40's it's hard not to have your mind bounce to that.