Dodging the DMA only has implications for Twitter advertising and federation, I think.
Basically, Twitter is not seen as a monopoly on the microblogging market, but it is still a very large communication platform that must pay special attention to moderation practices.
I imagine the brunt of Twitter's argument here is that they have strong competition from Bluesky and Threads, so are not seen as a gatekeeper in the market for microblogging advertising.
Because this confuzzled me, note that the EU's Digital Markets Act (DMA) and the Digital Services Act (DSA) are two separate things.
The Digital Markets Act is the one which is meant to remove economic barriers by "gatekeepers". For example the DMA is used to force Google and Apple to open their app stores.
The Digital Services Act is the one that regulates (among other things) moderation, political neutrality and removal of extremist content on social media platforms. That's the one Thierry Breton oversaw and threatened Elon with.
So while exTwitter's lawyers may sigh in relief, because they got out of the DMA; the DSA is still looming large.
Honestly kind of a cowardly move. They don’t want to deal with the Elmo, so they just declare it to be irrelevant? Eh. I guess better than nothing, but I expected more.