Help to detaching burner from Optimus no. 00

I focused the torch on the nut in fact, the burner was deemed defective already, and I will try to salvage it later if possible. I installed the new one and applied brass grease on all the threads after cleaning them, to prevent the same hectic task in the future. I didn't do any aesthetic work yet.
Pictures are below. I haven't lit it yet, but I now believe that the three stoves I inherited from my father-in-law are in working order.

 

That's a real knife fight! Good job man not giving up! @Migwar

 

Someone must have used exhaust sealing paste or thread-lock on those threads, @Migwar.

Tony

 

That’s possible, @Tony Press. I didn’t find anything between the thread lines, but it’s possible it was wiped clean by friction while unscrewing.

Thank you