I don't think those are contradictory. Say each notification has a 90% chance of being true, so it's reasonable to say "probably". After 10+ notifications, each of which was individually probable, it is still very likely that at least one of them was a false positive.

Perceptions of probability:

https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd....

“When using the app you are likely to experience false positives, and when the app alerts you, smart glasses are probably nearby.”

Nothing contradictory there.

Even “…when the app alerts you, smart glasses are likely nearby” might be reasonable.

That's not a dichotomy.