Overwhelmingly likely that it's a 2025/50th anniversary project at this point I'd say. Again, still not impossible something could be shoved through at the last minute for '24, but at this point I think it would be pretty unprecedented for a project anywhere near the scale we're expecting.
And yeah, no proof of RMC right now, but all rumors I've heard currently point that direction and all the circumstantial evidence matches with that possibility so far (height, highest point location, etc). Unless/until something else pops up, probably reasonable to assume that with so much smoke, there is probably a fire with the RMC rumors. That's especially true on the heels of the (seemingly wild) success of Iron Gwazi.
The wildcard here though is this: Maybe this was an RMC project when it was slated for 2024 but plans for the site may have changed again. I haven't heard anyone claim that and see no evidence to directly suggest that, but as we've seen so many times during the extended "Madrid Arc" saga, delays often mean somethin' is up.