The journalist himself thinks it was leaked to him from Trump or one of his people on purpose. Hence it is not a fact, is debatable. Debatable also means I am not making up my mind just because I want it to be true.
And again, the record is from when Bush was in office. Now if he releases his current tax record and nothing is there, then I will still believe him in violation of the 25th amendment.
But because he's not a Democrat you want to give him a free pass?