I learned the history of Brer Rabbit and how it pre-dates Uncle Remus and Song of the South from black Disney fans and fellow cast members back when I worked there. It was what turned me onto the idea of reclaim over replace in the first place. Of course, we're both just two white guys debating what we think black people would want based on something we've heard from black people in the community we don't personally know. So, neither of us can claim any authority really.
I never put too much stock in Twitter reactions since it is a site with a notoriously terrible, over-reactionary community. Especially the much maligned DisTwitter community. The reaction I've seen from POC friends and Disney fans of mine has been significantly more mixed. Same on other social media sites. Even if mostly everyone gets it, not everyone agrees this was the best course of action. Even Twitter gets more mixed in the reactions for POC Disney fans once you get past the top layer of popular influencers and overwhelmingly majority of white people trending. Heck, even what you posted, two were the same guy and two were just about a PatF ride with no real connection to Splash itself.
I do understand and fully agree that something had to be done to address Splash Mountain and it's heritage. I just don't think this was the best option for that and that Disney is just using the current to cover up the backlash of replacing a classic, (essentially) IP ride with a much more marketable and merchandisable IP that doesn't fit the land it is in. Modern Disney Imagineerings go to move that always gets significant backlash, but now Disney can hide behind looking progressive.