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In BIOS, see if there is the option to manually assign the IRQ resources and change the offending port IRQ so it is not the same as the WiFi card.
Not all PC's have that option.

Hard to really diagnose without seeing any relevant dmesg output or any info regarding the address of the parallel ports before failure and when failed.

If ptest works Linuxcnc should work.

Yes, the RS-422 is their smart serial connection between the 7i97T FPGA main board and 7i73 and 7i84 daughter boards. Since there is only one RS-422 configured standard on the 7i97T (on TB4), you can only connect one of those two cards, until you reflash the 7i97T to reconfigure some of the pins of the P2 expansion port to provide a second RS-422.

Glad you are enjoying my videos. It is fun to dick around with this stuff
Cheers,
Mark