PSA tests are not given to men over 70. It was found that there were enough false positives that men were subjected to treatments that they did not need which were expensive and somewhat dangerous. Biden had one at age 72. Everything was fine and above board. Biden's physicals were released to the public. Trump wrote his own physicals from Bornstein onward. They are bad jokes.
There is no conspiracy and no coverup. Bidens' mental decline and age were the reasons the Dems moved on. Trump's stupidity and mental problems do not bother the Republicans.