Not exactly, not in those terms. There's a whole thing about the return of Ra in dark times to fight a terrible evil, but that sort of prophecy is a dime a dozen. There's not a blazing sign telling people to come get their gently used cosmic power here.
Its obscurity isn't really broken either. The black court might know something, but there's not a lot of evidence of how much. Moreover, it clearly has some strong defenses now and was only vulnerable because the whole city was out of control.
The blampire needed us to get his shot on top of that. If someone wants to try stuff now they need to get through all the normal defenses and the attention of the sin eater now that it's active in the community and closely allied to the Ra cult.
There aren't more rumors running around today than there have been for the last hundred years, and it's less vulnerable now in any case.
It's possible to make an argument either way, though I think my position is more reasonable. Unless we're forced to move on it I think we should approach this on the DF timetable of years. If we don't then we aren't even going to really get to see our own impacts on the setting because we'll blow up the plot rushing between major arcs before they catch up with us.
It's just less enjoyable as a story and a game to skip all content other than the boss fights so to speak.
I think I might be communicating it badly. I am not saying "everyone and their grandmother will learn that a Solar Exaltation of Dawn Caste, forged by the hand of King of all Craftsmen Autochton for the War in Heaven in the First Age of Creation, serial number XXX is being held there, ready to be released". Not at all or anything like this. I am saying that:
1) Cult of Ra Descending, as new major players in town, will be investigated in detail by all interested parties. At minimum this involves LoC, and almost certainly White Court. Agents of other organizations, including Outsider aligned ones are also likely to make moves, but less likely to be successful
quickly.
2) There was a prophecy that led them here, and was at least partially correct - it predicted a major Outsider plot. Something, I'd like to point out, that Knights of the Cross failed to intervene in. Anything that can predict what seems to be the greatest Outsider attack of the last century is either major, major mojo, or connected to Outsiders itself (and is using insider info). The fact of the prophecy is likely going to be easy to discover, it seems to have been known to the cult members. This alone makes the whole cult, and the object of their worship a target of interest to LoC and other organizations.
3) During the crisis
something held by the cult very nearly got released. That is also likely something that likely can be found fairly easily, and I wouldn't bet against various seers detecting the near-release of the shard. Solars are a big deal, after all.
Putting all these points together, I expect cult of Ra Descending to become a target of infiltrators and investigations within the next month, with LoC being first to send agents, both overtly and covertly, White Court second, and everyone else third.
Your contradicting yourself here. On one hand your saying that it's easy to tell what the statue is holding if looked into, an object of power to be granted. On the other hand your saying that even as the statue was actively worshiped no one would have looked into it even if they did see a need to look into the cult that worships said statue and thus not realize it's significance since it's apparently "easy".
That doesn't make sense.
With close investigation in its current condition, I expect it to be easy. I also expect no one to have investigated it closely before. Magical cults and organizations are commonplace, and White Council is stretched very thin. However, since the events of Vegas, the cult became much higher priority target for investigators.