He had a forearm injury - that's why he had a terrible June and a reason to believe he can improve. Let's not act like he's been terrible all year because that's patently false.
Here's his OPS by month over the last two seasons (not including July 2023 as he only had 11 PAs):
.442, .756, .886, .670, .844, .710, .788, .825, ..784
One of these sure looks like an outlier, and a reason to believe the forearm injury was legit, and a reason not to trade for a mediocre 1B such as Canha or Cron. Does he deserve criticism for trying to play through it? Hell yes, whether it's machismo or whatever, he should have told Counsell about it and sought treatment a lot earlier because trying to play through it cost his team. But history shows that he - when healthy - can provide just as much offense as anyone they can realistically acquire.