...but, your point is taken.
If you want to compare this with a similar recent situation with an actual high-profile journalist and real high-profile story - Ronan Farrow and his former employer NBC are still bickering over whether NBC unethically spiked his MeToo reporting. I don't think at any point either side has emitted a Greenwald-style screed-de-coeur, despite the bitterness of the dispute.
https://www.businessinsider.com/ronan-farrow-nbc-harvey-wein...
As far as I can tell, the "tantrum" they allude to is better stated as 'exercising his contractual rights he negotiated as a founder for exactly these sorts of cases'.
And he has listed in his contract that he can publish without editorial oversight. The emails from the editor are very clearly are drawing a hard line that certain themes won't be publishable, in contrast to his contractual rights. Him taking offense to that is the basis for them claiming that he's having a "tantrum".
It's very clearly about contracts.
I guess it I have a hard time understanding how one can read all of the presented material and come away with the impression Glenn Greenwald is the misrepresented party in some vigorous but rational and fact-based discussion.