Why ?
I see this distinction as confusing too.
If these anti censorahip tools are VPNs, they should be in the VPN category. We can just explain the specific aim of their project, which may be more specific than Mullvad etc. (?) Afaik Proton and Mullvad also try to escape censorship, and work (not all the time obviously).
Do the VPNs in the second category also have DNS block lists ? And other tools to fight network/mass surveillance ? If so, the two categories are definitely mixed.
The VPNs in the first category very much try to appear as VPNs of the second category…