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Maybe the OP was edited in response to this, but right now it does link to exactly the same thing as you do. Search for "Let's see how yes does it".

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Can 4 year old posts still be edited?

No idea, but the link was there back in 2020:

https://web.archive.org/web/20200122231049/https://old.reddi...

They recently-ish lifted the restriction on only replying/voting in threads 6 months and younger - I'm not sure if that also applies to editing, though, nor how far back it goes

No it wasn’t edited I just didn’t notice the link.

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