They are not hotfixed. There is nothing to be hotfixed.
They are just extremely rare like 1 in 1000 or even less.
Good luck "farming" them ^^
This is disturbingly wrong in two ways.
One, of course there is something to hotfix. If there is a BoE variant of something meant to be solely BoP that's acquired unintentionally by chance, that is something to hotfix. I have no idea what point you were trying to make, but wow.
Two, it's not 1/1000. There is absolutely no reason to believe it's anything other than an equal chance for every relic in the pool for each relic slot, and there is nowhere near ONE THOUSAND relics of every type.
Stop confidently posting misinformation.
Edit, on topic:
They are most likely hotfixed.
Of course there will be a few people (I won't name names) who 3 expansions later will say "it's market trends! there isn't sufficient proof to determine whether or not they are! people just aren't farming the sentinax as much, trust me!" (woops, gave it away) But just like 810s were patched LONG before so many wanted to admit it, this was probably patched a week or two in.
I would love a screenshot proving me wrong, not doctored of course. Believe me, I want a shadow 910. It's just not happening.