Oh nobody's denying that there aren't academics who easily fall for Russian propaganda. I mean, even Carl Sagan fell for the one where all this started.
That doesn't change that we now know better.
https://www.quora.com/Are-the-studies-on-nuclear-winter-false-and-are-all-a-lie
Well I mean murdering someone breaks the very definition of libertarianism so you can be very sure they're just using that moniker because it fits whatever they're really trying to accomplish.
https://www.hoover.org/research/take-it-limits-milton-friedman-libertarianism
But you're absolutely right that a lot of people who are today clearly cheering for fascists used to call themselves libertarians.