Here's the thing with Tokyo/the OLC:
1. Because of the specific arrangement created for Tokyo Disney Resort back in the 80's, Disney cannot force the OLC to change Splash Mountain or do anything it doesn't want to do.
2. Splash Mountain is incredibly popular in Japan
3. Princess and the Frog bombed hard in Japan
Because of that, there's a zero percent chance that they will convince Tokyo to spend the OLC's own money to go along with a plan that will fit with the other mountains. The OLC has no incentive whatsoever to do this. Even Disney they somehow managed to convince the OLC to do that, quite a lot of their plans would have to be redone for DL's Splash.
Back in California, Disney has had the opportunity to redo Tomorrowland since 1998, and in that time they have studiously chosen to do literally anything else instead, including things that didn't need to be done at all, instead of fixing Tomorrowland. So far as I'm concerned nothing is happening in Tomorrowland until they bring out the construction walls and cranes. They don't care.
I won't believe that the Splash redo is cancelled until 1) multiple seriously credible insiders prove it to be correct, 2) Disney themselves makes an announcement announcing that it's staying the same, or 3) it's been five years and nothing has changed at all.