They (presumably) do after Chevron deference was killed

I don't think this exactly the takeaway of Loper Bright Enterprises v. Raimondo. It just means judges have more power to weigh in with their own opinions when there is ambiguity involved, not that all the specifics of implementation _have_ to be specified to mean anything.

Not entirely true, Operation Chokepoint 2.0.

I'm not sure how this is related. The so-called "Operation Choke Point 2.0" (which as far as I can tell is just a term used by the Trump administration to describe behavior of the Biden administration) is about bank regulation, which is not under the purview of the SEC.