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I think you are right about the Elgato PCI-e models not working on Linux unfortunately.
In case you are ever in the market for a new capture card in the future:
99.9% of USB capture cards work out of the box. Alternatively, if it has to be PCI-e: Blackmagic provides first-class Linux drivers for their PCI-e cards.
We use some Blackmagic cards for larger projects and for the smaller ones we use Elgato USB capture cards.
That’s good to know. Hoping someone can figure it out. There’s someone who got the m.2 working supposedly. Might see if I can tinker with it.