But it makes the most sense as Disney doesn’t have IMAX for that date, if they can’t get IMAX they likely won’t put a film there, especially as we have yet to know how congested the Fall-Holiday 2020 schedule will be.
To add onto that a lot of films in 2021, may just be 2020 films, and a lot of MCU films scheduled for 2021 that aren’t far enough in production.
The likely scenario is:
Black Widow - November 6th
The Eternals - February 12th
Shang Chi - May 7th
Spider-Man 3 or Strange 2 - November.
The other one and Thor 4 goes to 2022z