The issue is the condition on the apology:

> If this “experiment” personally harmed you, I apologize

Essentially: the person isn't actually apologizing. They're sending you a lambda (or an async Promise, etc) that will apologize in the future but only if it actually turns out to be true that you were harmed.

It's the sort of thing you'd say if you don't really believe that you need to apologize but you understand that everyone else thinks you should, so you say something that's hopefully close enough to appease everyone else without actually having to apologize for real.