"The Disney Blog" is not affiliated with Disney so that is just their opinion, not Disney information.
Disney says "Summer" and bloggers have dates all over the place.
There was a photo posted that was a screenshot which could have been off a Disney HUB location which states May 27th.
Based on some previous Disney info, I would not be surprised if this is correct.
Once Disney actually announces a date, I would start looking at FP+ booking opening and soft openings.