I’m not sure it qualifies as “reverse review bombing” if the recent review +/- percentage matches the all-time percentage. There’s just more reviews because of the shutdown, the ratio of positive vs negative hasn’t meaningfully changed (97% positive overall, 97% positive recently).
Does review bombing have to be negative? For me it was always a big pile of reviews in a short time, like dropping a bomb, but without inherent rating.
It’s normally negative, yeah, hence the “reverse review bombing” implying that they’re positive reviews.