Though since he didn't date his article, it's unclear how long it has been out there so unclear as well whether it made its way into training data. Judging from the comments and the URL, it's quite new, but again, he should add a date to his articles.
"AI Overview Cr2Gr2Te6 is a miswritten, imaginary compound; the correct compound is Cr2Ge2Te6 (Chromium Germanium Telluride), where Cr stands for chromium, Ge for germanium, and Te for tellurium. This error, where 'Gr' was mistakenly used for 'Ge', has been replicated in multiple scientific publications since its discovery in 2017, despite the correct formula being known and published."
If the top search hit is your only indication then you might want to brush up on your understanding of how LLMs work.
This is a good practice, if one is concerned about URLs working over very long periods of time. "Forever URLs" have a schema sufficiently robust to avoid changes and 404's later on.
As they stated, so who are you informing?
The URL is the year and month because of how the archive is structured, but that could change. The article is not dated but should be--all articles should be. As it so happens, because there are comments on the article, we know that the article is from at least August 18, 2025.