It would be a lie, but there is nothing in law about lying on a website unless you are falsely advertising for the purpose of swindling money. If you’re saying that he should be disqualified for moral reasons if he lied, hey he shouldn’t be allowed to hold his Senate seat as far as I’m concerned because of his votes, policies, opinions, and ignorance, let alone assume POTUS. But until something illegal is done and proved or something irrefutable emerges over his quals, his status will be decided by the voters not the magistrates.
It is illegal to alter a birth certificate.
It’s an issue of about integrity. I know many people have a hard time these days with that concept. I expect presidential candidates to be honest. He may have or may have not broken the law. Outright lying about his past, especially about this, disqualifies him as a serious candidate in my view to become president. Of course the fools may elect him despite his moral character flaws. No Thanks.
At a minimum one could argue that since the office of the president is a paid position, this is for money...