Huh?
That's not actually a rule or law that any company has to obey.
Disney can release any updated concept art they want to. But they chose not to for their latest 2024 dog and pony shows for the locals, and instead just recycled the old and very vague concept art they first rolled out in 2021. Three years ago.
Either they really have no idea what they're going to do with this land yet (likely), or they are too cheap to invest any more money into the concept until they actually know what they might do with the land in the 2030's (even more likely).
All of that points to this
DisneylandForward thing being a plan in unfunded infancy that will take decades to play out. Sit back and relax kids, this is gonna take awhile...