From the complaint:

Twitter’s change in ownership in October 2022 has not led to improvements in how it acts with respect to copyright. On the contrary, Twitter’s internal affairs regarding matters pertinent to this case are in disarray.

So you seem to not be far from the mark here. The NMPA has become increasingly frustrated with the “slowness” of DMCA claims during the AIMP summit in February. Israelite has indicated that Twitter stands alone in how it’s handled DMCA requests, which has been to largely ignore them, and that Twitter should lose protections offered by the DMCA to tech companies.

Honestly, I think the NMPA’s talk of “hiding behind the DMCA” really hits at their take on things. I mean, Twitter is a shit show for sure, but I think if the recording industry had it their way, they’d get a chunk of pretty much every website no questions as opposed to the “give people a chance to get out of jail free by just removing the content.”

But all that said, the company that autoreplies the poop emoji to all emails does not surprise me that they’re forwarding all DMCA takedown requests to the recycle bin.