Correct. Trump set the precedent by claiming that pardons made with "autopen" are invalid, based on nothing. Accordingly, pardons made by a senile president who just blindly signs whatever's placed in front of him¹ are also invalid.
¹ Trump on Binance cryptocurrency tycoon he pardoned: "I don't know who he is" -- https://www.cbsnews.com/news/trump-binance-cryptocurrency-ty...
