The expression return $this->label ?? t...d_view::grid.deletion') could return the type array which is incompatible with the type-hinted return string. Consider adding an additional type-check to rule them out.
It seems like $this->display can also be of type true; however, parameter $callback of call_user_func() does only seem to accept callable, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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if (is_callable($this->display) && !call_user_func(/** @scrutinizer ignore-type */ $this->display, $row)) {