Frankly it’s the kind of endorsement that is more helpful. If a moderate Republican retains the rhetoric but otherwise rejects Trump, well that might sway moderate Republican voters. If he declared the entire party was mistaken, well he loses those folks and only appeals to the folks that were already in the Harris column.

A republican saying that the Democrats are still bad, but Trump is uniquely worse and has lead the Republican leadership to lose its way, that might appeal to some people that thought to vote r no matter what, even if they had doubts about Trump.