Trump did only marginally worse than Republican House members did. In two-way races, Biden beat Trump 52.3%-47.7% while congressional Democrats beat congressional Republicans 51.6%-48.4%. The Republican House outperformed Trump by 0.7 points. So while it is officially technically true that the party outperformed the president, it’s hard to read much into its significance.
For those who think they smell a rat, it’s circumstantial evidence of fraud on account of a disproportionately high percentage of “president only ballots” going to Biden.
On the other hand, 19 congressional Democrats ran unopposed compared to just 8 Republicans who did so. That means there were 11 more districts for some small number of people voting for a House Democrat voter to vote for Trump than there were districts for a House Republican voter to vote for Biden.