In a word: Yes.

As in all the above to greater/lesser degrees.

While theoretically the president has authority to know about all of this, the reality is people/groups very likely obfuscate their behaviour/projects/agendas in myriad ways.

So fo any of us not closely connected to any particular story/allegation/project, the likelihood of learning anything with any veracity is highly unlikely.

I say this as someone with family in both military and aerospace who have varying clearances (fairly run-of-the-mill stuff, nothing significant), and I can tell when they avoid subjects which could expose they know something (again, nothing to do with UAP, just mundane tech, things like materials tech or current/past intel capabilities).

If they won't even talk about mundane stuff from multiple decades ago (I've looked at military records, which give hints to what they were involved with), I'm pretty sure anytime we hear supposed "secret" intel, it's likely to have been carefully orchestrated for a specific goal.

The core idea is that there are legacy programs that have acquired and are covertly researching non-human technology and biologics. These are a combination of compartmentalized government groups from the DoD, DoE, CIA, etc. and private contract companies. The programs are sealed away by over classification that prevents oversight. Even if you have clearance to know about the programs you'd need to know where to find them and who to seek for the information. And, just because these groups fall under a larger group like the DoD doesn't mean the chain of command above them is in the know. They know that there are programs, they know just enough details about them, and that they're needed. Outside of that, there is deliberate ignorance to limit any direct liability and to obfuscate effort to look into them.

While some individuals in Congress would have had briefings on incidents and certain programs in the past, they were still in the dark of the programs as a whole. David Grusch and other individuals provided testimony to help connect the dots needed for them to pursue disclosure. What Congress currently knows is pure speculation to the public, but there had to have been some damning details emerge that it has become a bipartisan effort in both the House and Senate to seek disclosure.

Naturally, there has been opposition so far from the DoD and members of Congress whose primary donors are companies with military contracts. Thanks to some legislation that has passed and more that is in the works, it seems that a form of disclosure is on the horizon. What the disclosure will entail and whether it will truly reveal any form of non-human intelligence is yet to be seen. But, over the next few years there will be details on legacy programs come to light. Some details will remain classified, but there should at least be enough come forward for the public to have a gist of what's been going on and if there is indeed non-human intelligence involved.