Writtin skills vs. Writing skills

[Ronron66]

Must have excellent written skills.

Is this correct grammer? I say no, but you see it in numerous job ads.

I say the correct way is "Must have excellent writing skills".

[Mister Micawber]

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My opinion is that the job ad writer has poor writing skills. (And someone else cannot spell grammar!)
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Native English teacher at Mister Micawber's