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Asus ROG Maximus XI Apex DIMM.2 wiring direct to CPU (shared with GPU) or via PCH?

Level 7
I recently got an Asus ROG Maximus XI Apex. I have not yet assembled it as I have made an observation with regards to the wiring of the included DIMM.2 slot for SDDs. The manual states that the PCIE 3.0 x16 slot(s?) will run at x8 if SSD are installed in the DIMM.2 as to my understanding it should in principal share the lanes with the GPU and not go through the PCH, though on the specifications tab online it in contrast suggests the DIMM.2 may actually be wired via the PCH instead. I am only using one GPU and I am aware even the mighty 2080Ti just about barely saturates PCIE 3.0 x8, though I would really like to keep the GPU slot running at x16 (future proofing beyond 2080Ti), though together with a Samsung 970 Evo Plus 1TB nvme as primary storage and a single SATA drive as secondary. Any thoughts around this discrepancy of the documentation pertaining to the wiring of the DIMM.2 slot, what is the correct answer? Many thanks.