I've seen other posts here before with similar offerings such as Looking Glass; does this make use of GPU passthrough or does it use GPU virtualisation? I ask b

I've seen other posts here before with similar offerings such as Looking Glass; does this make use of GPU passthrough or does it use GPU virtualisation? I ask because my Linux machine doesn't have onboard graphics on my CPU so I can't use passthrough solutions to achieve good performance (didn't realise I needed this when I bought my parts).