I don't think that officially says the libertarian party supports it. Just that it may be compatible with their principles. I'm quite certain many libertarians would not go along with that at all.
This isn't a no true Scotsman fallacy, because parties do have official, stated platforms. And to my knowledge, this is not part of the Libertarian party platform.
Being able to find some members of the party who support an idea is not the same as saying that "many members" support it. And frankly, I'd be very skeptical of the notion that this idea has widespread support within the Libertarian party, given the rest of their platform and values.
