heat sink solution for light source around 1000°C
They claim it can be mounted on a PCB. Easy enough to test it on a bit of perf board, though the manufacturer should be able to advise. Definitely put the reflector shield in place.
I suggest using a couple of Mill-Max socket pins.
It's only 11W, so aside from IR radiation heating the PCB, it's not necessarily much worse than an 11W power transistor.
Note: If/when you get a definitive answer from the manufacturer or supplier, you should make your own answer and choose it.