The two houses will again be open Sept. 26-27 and then from Oct. 3 through Nov. 1.
Universal says it now expects the economic impact of the COVID-19 pandemic to stretch into 2021.
Comcast CEO Brian Roberts said some guests may not return to theme parks until a COVID-19 vaccine is available.
Premier passholders can register for a preview on Friday, Sept. 18.
The rumor was reported by WDW News Today, a site which once said it was "at war" with the Walt Disney Company.
Additional notices filed with the state of Florida bring the total number of affected workers to 2,306.
The layoffs affected Loews Portofino Bay Resort, Cabana Bay Beach Resort, and Universal's Hard Rock.