Not true, case law is well established in this area. All laws signed would unfortunately still be intact. Also, he could not be arrested or peosecuted except by the house and senate, the constitution is very clear in this area.
With respect, a law signed by someone not qualified by the definition in the constitution to be president, is a fraud.
It would be like the young man who pretended to be a DR., an airline pilot and other professions but was not qualified for any of them. He committed fraud.
Elections are irrelevant if the candidate running is not eligible. This is spelled out in the constitution. The party running the ineligible person must field an eligible one is just a few days.
Because so much time has passed (4+ years) the untangling of the mess would be amazing but the fact of the fraud could not be questioned.
Further, every person in our government who swore an oath to protect and defend the constitution is guilty of malfeasance at best and treason by some measures. This would include all of the secretaries of state for all 50 states and many, many others whose sworn duty was to verify eligibility.
I do not believe case law covers the scenario I have laid out because it has never happened before, although it is plainly happening now.