CSS wouldn't be used to spy on your network traffic; if they wanted your internet data, they'd have much simpler methods to collect it than CSS (and they wouldn't be able to decode most of that data anyways in normal cases).
or who I am accessing it from
What do you mean by that?
Suggesting that a VPN could mitigate stuff relating to CSS is like wearing a floating vest 24/7 when flying in a Boeing plane: you might feel a bit safer with it on, but it'd probably be smarter to have a parachute instead.