Not the poster you quoted, but I agree and will give you my reasoning. A few years ago Disney became VERY good at manipulating crowds. During slower times they adapted staff and ride capacity to meet the demand, making it "feel" crowded even during non-peak times. Then Covid hit and made crowd calendars even more useless, for a few reasons:
1. Limited capacity at all the parks
2. No more special events or EMH (which crowd calendars were generally based on)
3. School calendars all over the country have been modified, again throwing off traditional crowd calendars
IMO the only "rules" that really hold true at the moment are a) DHS is always crowded and b) Epcot will always be more crowded on the weekends.