I just took randomly one of his recent posts more.
First let's look at the grammar. As you can see English is not my mother tongue so I can't be an expert, but it looks like Adams0001 writes in nearly perfect language. Native speakers can confirm or not, but online grammar checkers say he is great.
And unexpectedly we see that there are two incomplete sentences in this post (marked with yellow; looks like he deleted some parts not to be detected). Strange, right?
Let's ask some detectors if this is human written? Copyleaks says no, 72.3% of probability fir AI, Hivemoderation says no, 58.1% likely to contain AI Generated Text, Sapling says no, 86.3% for fake.
Okay, let's detect for plagiarism with text.ru. And what was expected, we see that this post is copied from invstr.com/risks-and-rewards-of-investing/ for 47%!!! Nearly half of this text entirely from some single other source!
And moreover each time we see that a plagiarism tool doesn't say that there are many others who read some texts in Internet and used the same words. No, it finds an exact text which was a base for AI to generate this exact post. But there are hundreds of millions users in Internet who writes in English and read some texts. How can they not say some way the same things with the same words? It doesn't happen so usually, and even if here was an outstanding case, then not two in a row.
And you know, I decided to go through the challenge. I decided to check all my own words from the text above with the same 4 tools I used for Adams0001's post. Copyleaks gives 79% of probability for Human, Hivemoderation gives 0% likely to contain AI Generated Text, Sapling gives 7.6% for fake, Text.ru says 100% unique. As expected, because I really wrote everything of this by myself. And reading other texts in Internet didn't make me writing like AI.