It's hard to know without doing a placebo controlled trial. I eat Activia every day, but even I'm not sure it's having any effect and I don't trust Danone's own research. Overall, research seems to be mixed:
https://badgut.org/information-centre/a-z-digestive-topics/p...
Still, I think it's worth using probiotics, as there don't seem to be any negative effects.
Alternatively maybe I was already moving past the hump and would have felt better regardless but after antibiotics I’m not sure how I’d get back to a good baseline easier than yogurt or sauerkraut.