I have read the document, but there is nothing I myself can further try in terms of kernel and builds.
But you could ask a dev if he/she is kind enough to make a test build with a recompiled kernel without the module mentioned above for you. heitbaum is active in this thread. Maybe he/she is reading this. 
Maybe snd_intel_dspcfg is directly built into the kernel image using the parameter =y? In this case blacklisting might not work.
I fear karpediemrsi has given up the challenge to get the PN50 to work.
Pity!
I would have liked to ask him a few questions:
After experimenting a bit it seems to me that the IR support is not completely disabled masking only eventlircd.
I am using a Xbox 360 Media Remote (the older white one) in connection with a FLIRD 2nd gen. The On/Off button is configured to call the Shutdown menu of KODI. That works flawlessly when IR is disabled on BIOS level. But when IR is active KODI is shutdown pressing the On/Off button . The Shutdown menu is only visible for a short moment.
Is there s.th. else running which has to be switched off to disable IR support completely?
Thank you very much. That worked perfectly.
I want to get rid of the IR support in Kodi permanently, because I am using a FLIRC to control my Kodi system.
How can I achieve that?
I tried systemctl disable eventlircd.service, but that didn't do the trick.
My system:
Intel NUC8i7HVK with LibreELEC 9.2.2
