What I meant is, that (apart from positional information) you can only give one bit of information about the thing in question: it is there or not. There is no internal complexity to be described. Perhaps I overstreched the meaning of Kolmogorov complexity slightly. Sorry for that.

There's a quite popular view hereabouts according to which the universal wave function is ontologically basic. If that view is correct, or even possibly correct, your construal of "ontologically basic" cannot be, since wave functions do have internal complexity.

I don't think that' a slight overstretch: how many bits you can give about something doesn't have much to do with its K-complexity. Moreover, I'm not sure what it means to say that you can only talk about something being somewhere and its existence. How then do you distinguish it from other objects?