There are too many things to really worry about it too much. It's not really how language works anyway - like would you say "You don't want to call your organisation the Rare Books Association because 'rare' is only one letter away from 'rape'?" - clearly that's ridiculous.
I used to study news, which meant reading a lot of it, so maybe I'm not representative, but I immediately noticed that.
Whoever tastefully drew their logo in lowercase might've warned them not do it as all-caps elsewhere, if they were aware of the US brand issue.
If I had to refer to this brand name in text, such as in specs, I wouldn't do all-caps like they have. (To US people, who may be familiar with the toxic brand from written news, US journalism style guides tend to put initialisms and acronyms in all-caps, unlike in parts of Europe.) I would capitalize only the first letter.
I've seen other comment for the supposed unsavory thing but I've never heard about it, like, at all. Only know it as the mathematical operator. Also being used as card name for a children card game that's a bit infamously censor heavy so I think it's safe enough https://yugipedia.com/wiki/Mathmech_Nabla
I've never heard of it either until reading these comments (I'm in Australia). Assuming the NA in that acronym means North America (?) and given that Denx and this new entity is German it's probably safe to assume that they haven't heard of it either.