Definitely rewritten with ChatGpt. There are strong tells that even humans writing in this style would not do. Using "hum" 3 different times in the same text is one of them.

It is really a shame that people who do have something to say think that an LLM can express it better, because that is not the case at all.

Impossible to say, a few people really do write like that and their writing gets flagged by those detection systems all the time, but I think we all know which option is far more likely.