I've never published a BBC (or any journal) article before publishing a paper. As far as I know, the reviewers at Springer Nature could not care less if there's a press release attached to your manuscript, and some reviewers in medicinal journals would prefer groups don't publicize on media like Twitter to avoid biased reviews.

I must have just missed the "mass press release" portion of peer review.

There are forums for that. Not internet forums, "forum" in the original sense of the word. A public broadcast to the masses (the B in BBC) is not the forum for notifying peers in a professional field.

and yet, it also notifies peers in a professional field.