Nowhere in the original article does he "voice his support" for Trump. What he does say is that he doesn't think he's "as much of an idiot" as he is portrayed as. The interviewer then proceeds to ask if Trump is a positive change to the administration and Mateschitz openly ponders the question, but says the initial hysteria about Trump's election was a bit much. He says that the bad thing about democracy is, is that the majority is not always right, the good thing is that it's very easy to course correct a "wrong" election. But they should at least give Trump some time.
Then the interviewer asks him, on what points would you follow Trump? To which Mateschitz answers that he doubts Trump ever realistically thought he could build a wall on the Mexican border, but that some things are unjust criticism just because it's coming from Trump. As an example he cites improving relations with Russia, because it makes no economical sense to boycott Russia and ruin that country, especially since Russia is a part of Europe and important to them. He says that the "political correct" (later further defined as the "intellectual elite") will say Russia is a "State of evil bad guys, and we are the good ones and everyone who says otherwise lies." He states this is terrible for the freedom of speech, because these people only value this when the opinion stated is their own. Mateschitz says that he doesn't need people like that, telling him who his enemies are for him.
The interviewer tells him he is one the elite, is he not? To which he defines himself as Humanist, Kosmopolitan, Pacifist and Individualist. He says he hates people who want a Opinion-based Dictatorship (as explained above), which he says immediately gives judgements from others. In the US you're a Communist, in Europe you are a "conspiracy theorist" or "Right wing populist".
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Interview is a lot longer, but my main take-away is that he's an old man with convictions. I might not share them, but I certainly won't judge him for having them. We're adults, we're entitled to a different on opinions on matters.
My main take-away from the article certainly isn't that he supports Trump though. That's a misrepresentation in the English article.
