It's an opinion piece, and exceptions confirm the rule. Just search for German news articles on Google.de. See how many legit news outlets mention "Musk Hitlergruß" and how many more opt to beat around the bush when you search for "Musk Geste".
Do you even get a count of search results? They no longer include that number in my search results.
But I have just tried "Musk Geste" on google.de news tab (I don't know how Google is personalising either my search results or your results, but FWIW I'm in Berlin), and of the first page, 6/10 links explicitly call the gesture a "Hitlergruß" in the summary, and the other four call it that (or note that some people have called it that) in the body.
I mean, that was a link to a German newspaper and the headline is:
> A German Eye On Elon Musk's Hitler Salute (Yes, That's A Hitler Salute)