The article doesn’t rule this out. Most of these emails are templated out in some 3rd party email service. It is extremely plausible that the author is unaware of the text email content.
If someone had a rejection email then we could check this. But
Reading the article is most improper on this here orange website. You’re supposed to read the headline, and imagine what the content of the article might be.
Yes, I did. My point is that the author might be jumping to conclusions. It is far more likely that they introduced a bug in their content than it is that a bunch of email providers who haven't changed in a decade suddenly released the same buggy AI product without fanfare.