Johan
Ex got M3 in the divorce, waiting for EU Model Y!
You already noted the caveat that was added "for long distance charging". Also that is a slide at a presentation to some kind of energy company meeting, not in the ads. No where in the advertising does it headline "unlimited" as a feature. I believe someone also dug up a reference to unlimited in some software update notes, but other than that, unlimited is practically never referenced.
That's why I have been saying the oft repeated AT&T example does not apply to Tesla. AT&T advertised "unlimited" data in big bold letters for their data plan. Tesla never did the same, only the "free" part. That's why I say that Tesla is unlikely to be able to start charging money for supercharger usage, but they can do throttling if necessary (not that I want them to).
This is likely what they've communicated in written text. Emotionally and in talks they've communicated the unlimited part a lot.