I was reminded in another post that everybody is on vacation. Xur has an error, nobody is around to fix him. Shards are cheaper anyway, and since all the world drop exotics are basically shards in a different format, I don't mind the lack of 3oC.
Honestly I remember when bungie said 3oc were here to stay but I could see them removing them for srl. Hopefully the "bug" will be fixed after srl leaves and then will return to normal. If not they should really just be honest and say they removed them from xur.
If not then it's just lies again.
Personally I think they will return after srl (hopefully).
"Xûr will not be selling Three of Coins for the weekend of 12/23 - 12/25. We are investigating his expected behavior for the weekends to come."
It's bugged... That was from last weekend