I hadn't heard that but i would fully expect/understand it.
With the angry mob that descends on orlando during that two week period...if they don't have enough experience/data back on the system and haven't seen enough mechanical/technical glitches to where they feel they can repair/realign it if they have a system failure in a efficient manner...then they wouldn't risk having a potential major crowd problem.
It seems very prudent to just fall back on the old fastpass system for that period of time...its too new.
It was a rumour from several weeks ago, before the 60 day window for booking fastpass+ for that period.
Plainly now that window is open and people have been able to make bookings, this has proved that even if it were a possibility at that time, this has since changed.