pls try also a image from test.libreelec.tv, they include a much more recent kernel (5.15 at this time)
likewise they ninja changed the the chips at the board at some time
Luckily its a Hauppauge Card so the support should be doable at some point.
If it still does not work with the 5.15 kernel try to report it to https://github.com/b-rad-NDi/Ubun…-kernel-builder, he is the driver dev that does the upstreaming to the kernel for Hauppauge/WinTV