That's the best decision for WB.
Announce a new date the movie will be first be released in some international markets and then from there keep announcing new dates for every territory is safe for their cinemas to reopen.
Global releases are not possible at the moment and we don't know when that would be.
This needs to happen for international movie theaters to survive.
Probably other 2020 releases need to follow the same marketing and distribution approach as well.