Where is AI heading?
His critique of materialism isn't hard to agree with. Materialism does posit, ultimately, mathematical abstractions at the bottom of everything and ignores consciousness. But Kastrup's idealism--as expressed in that article--fares no better in that it posits consciousness as fundamental as a solution to ignoring it, but with no real insight into how it interacts with or why it's necessary to interact with matter in order to produce human experience. Or why human experience, which is the origin of the concept of "consciousness", is so special such that this concept turns out to the most fundamental map of the big picture. So, we're left without the only pieces of the puzzle that actually matter.
And necessarily so. Language is built for us to navigate and create physical, psychological, and social realities, not to express "fundamental reality", which is just that which is posited to be beyond the contexts in which linguistic meaning has practical consequence. So, we can run the discomfiting materialist script or the more comforting idealism script and pretend that they refer to something out there, but functionally the only difference between them is the emotional cadence. Linguistic relevance simply disappates into nothingness at the boundaries of such fundamental abstraction. Materially, we get symbolic mathematical interactions that don't refer directly to any observable phenomenon (i.e. empty abstractions that create holes for objective physical realities like the Higg's Boson to slot into) vs mentally, we get "fundamental consciousness" (an empty abstraction that creates a hole for the subjective mental reality of human experience to slot into).
Neither script solves any problem nor points to any actionable goal. It just adds another linguistic patina to our already overburdened social consciousness. Take them or leave them, materialism and idealism boil down to the same thing, fruitless stories aimed at elevating their storytellers into something they're not nor ever can be, i.e. vessels of wisdom that point to anything of actual significance beyond scientific progress and lived human experience. These are the true limits of our objective and subjective worlds and an admission of such is necessary for the development of any intellectually honest metaphysical position.