I know you were joking around in your post, but I just want to confirm if Haarms actually could sit a year? I don't think so?
According to this:
https://purduesports.com/sports/mens-basketball/roster/matt-haarms/8369
he joined Purdue it looks like for the spring 2017 semester (did not play, but was enrolled). And so his NCAA five year clock then started. Meaning it expires at the end of fall 2021 semester.
So if he sits the 2020 season, he would technically only be eligible to play through the fall? Otherwise, he would need to be granted an extension of his clock. That is usually done through a hardship waiver, which has fairly tight requirements to meet. You can't just get one because you want one.