Yep!
The altered hormone balance is what allows weight loss and if that reverts than so does weight loss.
I know this "you have to keep taking them" argument is big in anti-glp1 circles, but I don't think it's very good - the same is true of vitamin supplements. You have to keep taking them or the deficiency comes back. They still help.
I don't care for glp1s myself but i've heard how happy they make some, so i don't judge others' choices.