I downloaded the Urban VPN Proxy chrome extension using https://robwu.nl/crxviewer/ and grepped the source code.
At no point is window.fetch reassigned with their own function. There is no "window.fetch" anywhere in their code.
Also the variables sendClaudeMesages, etc in their first screenshot only appear there and are not used anywhere else in the code. Whatever those config variables are for, they don't do anything.
The rest of their code screenshots are legit (notice the legit ones have a smaller font?) but without window.fetch the whole thing can't do what they say it does.
Moreover, large chunks of that article is written with a LLM (it's koi.ai so I shouldn't be surprised) and ends with a pitch for their services.
This doesn't look right.
When a company writes a blog post, 95% of the time it's intended to juice their SEO rankings, rage-bait to go viral and boost their social media profile, or an ad disguised as an article. Be very skeptical of company blogs.