It sort of sucks for kids, but it certainly sucks for adults

I have seen the title from a page: I Quit: 2+ Years of Anki and the (Near) Impossibility of Learning Languages

It seems weird to me. I know “sort of” is an adverb, but I have seen a verb phrase is used as adverb and collocate with a verb again for the first time. Is it appropriate grammatically?

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‘Sort of’ modifies both predicates in this sentence.

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