That only applies to VROC. IRST remains the same. Dude, honestly, one day you'll nail it. See, this circulates right back to owning or using the platform, rather than blabbering vicariously. (That's a bit different to agreeing with the idea, which I don't. Especially the Intel drive only part)
Yeah some boards have a bit different setup but on most IRST remains as per previous generation with full RAID, etc. a lot of people don't seem to understand what VROC does and the implications for NVME RAID. You do have to watch out a bit though as some boards have different M.2 restrictions/setup to others on X299.