Probably not Trump's personal exposure or his specific mention of the Bidens. But the general commotion around his son's blatant hire-for-bribery - and the exposure to the public DESPITE the media's near-unanimous lies about it being “debunked” had an impact. “You cannot pull the wool over everybody’s head all the time, but you can keep some peoples’ head buried in the sand most of the time.”
I’d be surprise of all the circus and the hoopla didn’t bury Biden permanently. Perhaps that was the real goal, along with dirtying up Trump.