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According to many information like Is word count a large ranking factor for Google? and https://twitter.com/JohnMu/status/1021690796691607552 word count isn't a ranking factor.
But I have never seen that 300-word article (even 500 words) is on the first page for at least 500 search volume(monthly) keyword.
Is there any case study or an example to prove that "Word Count isn't a ranking factor"?