It is, but not really what a split tunnel is meant for.
You are forcing all traffic through PC_A. I am not sure why you want to do this, but if it is to circumvent the controls at Uni, then a consumer VPN would do this for you.
No need to put the load on your parent’s internet.
Twingate is meant to get you secure, zero-trust, specific access to your resources. This isn’t a great use-case, but yes it does work. You will have a TLS tunnel for all your traffic when connected.
I do not even do this. I have kids in Uni and I have them use a consumer VPN for this sort of thing instead of my Twingate network because it just doesn’t fit the use-case and is burdensome for everything involved.
If you do give it a go, let us know how you get on with it!
Anyway, I’ve worked it out. I deployed the docker engine on my pritunl vpn server. Then I used the server’s internal IP address as the Twingate’s Network resource’s CIDR and I can now ping my vpn server. For some reason it doesn’t seem to like internal IPs but I guess that’s an issue with the vpn server.