You are right in having a problem with an explanation that sets forth a distinction without a difference as it relates to the effect resigning or being forced out of office would have on past actions by a Constitutionally unqualified president. It makes no difference how he leaves office or when he does, all prior actions are ultra vires, that is without authority and all prior acts are null and void. That is a true Consitutional crisis which will cause grevious harm to this country. Anyone who would deliberately put the country through just epic tragedy should be tried for treason.