Indeed. It is quite hidden in FAQ, so by reading main page You'd still think pass was mandatory. I guess it makes sense, they want ppl to think they have to pay. VicB probably thought so as well.
This winter it is pilot to see how it goes, but next winter I suspect it will not be voluntary anymore. Personally I don't care as long as they let me park without pass if I'm going snowshoeing & not using groomed trails.