Rather than correct their error, Snopes deleted the part of the article which claimed the ban was being removed, pretended they'd never said that, kept their original now-unfounded conclusion, and wrote a blog post accusing the EPA of lying for claiming that they'd made an error in the first place. Good luck finding the original article with the error online now. (There should be a copy on archive.is, but they're having uptime issues now.) The Internet Archive basically helped one of the trusted sources we're meant to rely on to spot misinformation rewrite the past to gaslight the US government.
The Internet Archive also took the decision not to allow government websites to block content from being archived or removed around about the time Trump took office. So they're very selective about who gets to hide their past errors like this and whose pasts are permanent public record for all to see.
This reminds of when Salon published an article which was criticized for being too sympathetic to pedophilia, and when called out on it, simply deleted it and pretended they never published it. Salon has since started actively thwarting archiving services.
[1]: https://twitter.com/stillgray/status/833835031328124928
[1] yes, I know it doesn't say it outright, but I don't think it's a stretch to get the gist.
I would say not entirely in his own head.