Unfortunately, Milei makes it easy, with his support, explicit or not, of military fascist dictatorships, ultranationalism and Catholic fundamentalism.
If you're a libertarian, you do not equivocate about any of those things - you denounce them clearly and strongly.
You can be a staunch anticommunist and also anti-Pinochet. And of course, if you are a libertarian, you know that Catholic doctrine has no place AT ALL in public policy.
There is a difference between being a libertarian and being a Thatcherite-Pinochetist Chicago Boy.