Well he wrote some of his best in DBT while drinking. I think it's less about sobriety and more about getting his life back together post-DBT. I think he had to get sober to do that though. So my guess is both yes and no
im guessing a little less pressure than when he first went out on his own too, plus more experience creating an album instead of just a couple songs for one, all coupled with getting his own head straight is a big part.
with DBT a lot of his best was, yes while drinking, but when his life was in a fairly upward trajectory still. it seems like he is back in that upward trajectory.