Laurence Tribe: Being delusional is not a legal defense

Specifically referring to Trumpler he said:

"Detachment from reality, of the kind that Attorney General Barr seems to have detected on the part of the former president is a disqualification from the presidency, but it is not a defense to a criminal charge. Even in those very rare cases where delusion can be used to disprove intent, there is a doctrine known as 'willful ignorance.' [...] You can't simply make up an alternative universe, climb into it, and say that I'm comfy there, and therefore that I'm immune to prosecution. That's not the way the law works." 

So maybe concurrently we can legally argue that Trumpler is unfit for office by being detached from reality?