It seems like $processTV can also be of type string; however, parameter $process of Blacklight\processing\tv\TraktTv::processSite() does only seem to accept integer, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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(new TraktTv)->processSite($groupID, $guidChar, /** @scrutinizer ignore-type */ $processTV);