Nah, it’s just a old school chat bot following a predefined flow chart. And in this flowchart someone implemented an improper email check.
It’s pretty much the same as if there was just a website with an email field which then complains about a non valid email which in fact is very valid. And this is pretty common, the official email definition isn’t even properly followed by most mail providers (long video but pretty funny and interesting if you’re interested in the topic).