I’m shocked they even gave us this much and I clearly missed the patch notes notifying us of this change (was this recent?)!
Edit: I see it was in the notes from Hotfixes July, 20th: “The new socket adding item, Alloy-Warping Facetor and conduit upgrade item, Death-Bound Shard should now be purchasable by all characters on your account from Archivist Roh-Suir once one character has reached Tier 6 Research.” It does not mention the 226/233 upgrades and since that’s tied to renown as well as Tier 6, it seems that’s unfortunately “working as intended.”