No, I think it's reasonable to wonder whether some powerful enough agents have some "super secret tech" and aren't telling. It wouldn't be the first time. For instance, the US didn't exactly advertise having the atomic bomb before they first used it (although it was a very short time after and they did specifically work on the atomic bomb to use it as soon as possible).

That said, personally, I think it's unlikely.

First, the vast majority of AI research is happening out in the open. It's often funded by militaries (e.g. DARPA) but it's not owned by them directly, rather the owners are universities and similar.

Second, private corps promote their AI advances very aggressively and this marketing is a big part of the advantage they try to establish over their competitors, so it doesn't seem obvious why they would keep a new advance "under wraps". For example, what would Google do with a secret machine vision system capable of 20% better performance than that of its rivals? I can't tell.

Of course we can assume that Google or someome similar have a much more advanced system than anyone else, like a real AGI. We can imagine such a system sitting at the heart of Google, dirctly advice Larry and Sergey how to run the company. But then, if we can imagine that, we can imagine anything.

And I do mean anything:

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