Incorrect.
Its not “updated”, its a different set. And they announced that the original blue set (which can be equipped at 58) will come with Phase 2 and the second set (that was level 60 only) will come in Phase 6.
These are different items:
Phase 2:
https://classic.wowhead.com/item=17577/blood-guards-dreadweave-gloves
Phase 6:
https://classic.wowhead.com/item=22865/blood-guards-dreadweave-handwraps
What you’re thinking of is that they announced the Epic set will not be “updated” later and will be the 1.12 stats, because it was under-budget (not even as good as T2) when originally released.
The second Blue set is being introduced in Phase 6, because otherwise it invalidates a TON of raid gear through BWL and is easier to get (because it doesnt require poop-sock levels of time to get that rank).