I stumbled upon this question just now and of course went straight away to see this user's activity across the network where I noticed this:
I scratched my head, reloaded three times, chanted the "Cache Buster" song but there were no such comments on Anna post:
Which means... those two comments are now deleted and indeed, they do not show up in the Meta account activity of that user.
I can only guess it's related to this bug that is still ongoing, causing weird behavior of the network account cache.