That dedome was unrelated :) it's there in the picture just in case anybody wants to compare XRE EZ900/1000 vs XM-L die size.
The XM-L was from the king which I tried to dedome from the front so I don't have to remove the heavily glued driver to access the led/reflector.
I let the king run for less then 5 minutes to heat the LEDs. Obviously I underestimated the king's heatsinking ability, the LED was not hot enough and the silicone peeled off together with the wires.
Luckily I had three $3.60 XM-L emitter stars from DD offer last time. :P
They generally do that when they are out-of-stock and don't want to remove the listing. (There is more to this, but I don't remember the specific reasons.) Price will come down when it's back in stock.