I don't think Bell is wrong here, though.
Ownership wanted a change in direction, and they got it...out with Cherington, in with Dombrowski. It seems silly to "blame" Dombrowski for doing exactly what he was hired to do and behaving exactly as everyone expected him to - especially since (in 2016-18 at least) it worked out about as well as anyone could have reasonably predicted.
As for what went wrong subsequently... John Henry's fingerprints are all over the Sale extension at the very least, given his comments in spring training about not wanting to blow those negotiations the way they felt they blew the Lester situation. Knowing that his bosses very much wanted to avoid the distraction and spectacle of another ace pitcher getting ready to walk at the end of the year, it seems quite possible that Dombrowski felt some pressure from above to get a deal done.
In any case, I have questioned and still question why, if we believe ownership that they knew at least a year in advance that they were going to want to re-set the tax penalties in 2020, and that there were major disagreements with Dombrowski as to the future direction of the team as early as the World Series, Dombrowski was then allowed to continue writing fat checks to injury-prone pitchers. If the financial goalposts he had to work within were not made clear to him, or if he was somehow allowed to defy ownership's wishes and keep spending profligately, then that to me is on ownership.
Please note that I'm not trying to bash or complain about Henry & Co. (four World Series wins - end of story), but I think if they find themselves unhappy with the corner they seem to have been backed into with regard to the luxury tax, the first place they should probably look is in the mirror. Dombrowski makes a convenient but not entirely convincing fall guy here...I prefer to say thank you for the ring and leave it at that.