The date of inauguration was changed to 20/1 in 23/1/1933 by 20th Amendment created by the 72nd Congress:
It establishes rule that incoming Congress will vote if election deadlock & rules for if a president-elect dies, is not chosen, or fails to qualify prior to term.
There is just too much numerology crap going on here. And the health/mental capacity of the future president keep coming into view in media. I assume the 'fails to qualify' I would assume means mental impairment as per 25th Amendment. Even the WEF are concerned.
Here is short clip from WEF discussion where they show concern for candidates health and other considerations.
https://disq.us/url?url=https%3A%2F%2Fyoutu.be%2FKuwi54pZPXE%3AFexwrJpHiAuHPfFJRpt6OOERi2I&cuid=6381443