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I'm confused, did i do something wrong or why can i find the referred article just fine on google, just by searching the keywords?

becuase the OP wrote an article that links to these things, and caused them to be re-indexed.

It's not purely a function of 'date published' it is also about frequency of access

Ah true that makes sense, thanks for clarifying my confusion

You can find it now because it's getting traffic again due to TFA. It's no longer "stale."

Yeah, doesn't Google have multiple crawlers running with different missions? Ie, deep content crawlers and "fresh" content crawlers?