I don't know how to define "generated tweets".
I am 100% sure that some of the tweets I got back should be considered as "found"/"searched" instead of "generated". For example, I tried "bigdata", and one of the "generated" tweet is "Big data is like teenage sex: everyone is talking about it, but nobody really knows how to do it." and I believe this is not AI generated and is simply a copy of other human being's tweet.