Earlier quoted context omitted.
It sounds to me like a variant on the idea of a "meme" (in its original sense): https://en.wikipedia.org/wiki/Meme Consider that ideas (even facts!) might be like mind-viruses: you could imagine they propagate themselves in human minds, but are not actually produced by those minds. What if human minds are just the substrate?
at some point some ideas have to be created by some individual human who then transfers it to others, if we do not agree that the idea created by the individual human is created in their mind then we have to come up with another explanation of what they are created in. If we assume that a new idea, never before propagated creates itself we should have an explanation for how that works, which memetics does not have a…
Perhaps the earliest "ur ideas" were something like instinctive emotions. Even very simple creatures seek food and avoid noxious stimuli. Is hunger an idea? Maybe from hunger arose desire, and from desire arose searching, and from searching arose planning... Ad astra per fame.