My only issue with this is all of your disclaimers like "if true" or that you dont know
When I have seen Alex Speier, Buster Olney, Tyler Milliken, Jarred Carrabis, AJ Pierzynski all put their names on the line to say something along the lines of yes, Breslow made the negotiations more frustrating than they needed to be and made it easier for Bregman to take the cubs offer.
Beyond that, your post here is very reasonable. And it may be too far to call it a botch. But this happened:
If "bay all accounts" he did that, he made a mistake, but that does not mean he "botched" a signing that could never have happened, unless Breggie dropped the no trade clause.
One could argue the animosity Brez caused made it more difficult for Breggie to drop the no trade clause demand, and maybe there is truth to that, and indirectly, that was a botch.
And the only reason I can think of why you have a good take on what happened (your post is a good take), but you are not fully willing to accept that this happened is because you are trusting Joe over Google. And thats silly. Always fact check but ESPECIALLY when it comes from Joe Brady and/or Twitter.