Undercover Tourist also had the park crowds ranked pretty low for the latter half of October except 10/30 and 10/31. Even those two nights are only ranked at 7/10 and 8/10.
WDW ticket prices are also ranked according to expected crowds, and October is not a high-priced ticket month.
The other forum member used vague terms like "MK was pretty busy" and "Epcot was slammed," because Rat had a 90 minute wait.
IMO, MK almost always appears 'pretty busy.'
October is the Food and Wine Festival in Epcot. It is well established that people come to the park in the PM to eat and drink on the weekends, but that doesn't = a high crowd day, or equate to a high number of people buying Genie+. Epcot can be pretty crazy during the festival. The WS is full of people eating/drinking wandering, but the rest of the park is fairly empty.
Over the many years of reading WDW forums, a common suggestion I've read is to avoid the WS during festival weekends. (I don't mean that last sentence as my personal opinion, but rather a sentiment I have read a great many times.)