Didn't notice this earlier but there's now a small structure on the roof of the bridge. Probably a footing for a sensor?
It might be but the piece was in the same position in the previous photo from a month ago, so it could be a permanent structure.
Actual helipad height at the back?
Skywatcher and his partner's articles seem to be the goto source these days in the media. I'm seeing everyone reference their articles. This one The National Interest had an article out less than 19 mins from Popsci releasing theirs.