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Couldn't find the PR you're referring to, unless it was this one https://github.com/rapid7/metasploit-framework/pull/15007 which was added by the same author as the OP, but looks like a different exploit as far as I can tell?

I believe it's the same exploit, check out this reference here [0], and you should see the JS snippet

The code is somewhat different, although you may have recognized that most JS engine exploits look the same once basic primitives are constructed.