Privacy policy logged interface information

In the Tailscale privacy policy, it states that Tailscale logs “ALL” interface addresses. I am testing Tailscale with PFSense. Does this policy mean that Tailscale is logging all of the interfaces on my firewall including other private VPN interface addresses and information or just the Tailscale interface? What about routed subnets? Are all systems in the subnets logged as well?