Huh that is interesting. I found the official IAAPA page with the guidelines (
https://www.iaapa.org/reopening-guidance-considerations-attractions-industry) and I think the thing to note is that these are considerations/guidelines and not requirements. Some venues may choose to do more or less.
I didn't read the whole thing since it's 36 pages, but it's definitely good insight on what might be required when the actual parks open. I think it's interesting that they recommend against temperature checks as the primary health screening, which I totally agree with. I have to get my temp checked when I go into work each day and it consistently reads 95. If that were accurate I should be experiencing onset hypothermia each morning.