The problem is that those arguments are not falsifiable. If not one, but two completely reasonable explanation cannot convince you of someone motivations, nothing can. However, I don't care if Musk did or did not a Nazi salute. His actions speak much louder (in a bad sense) than the aesthetic that he decides to adopt. Proton donation pattern for example would be a strong indicator to measure intentions.
but it was a wildly tone deaf one if so
Maybe. But also maybe people are allowed to have different cultural references, and in a global context (i.e., the internet) we should expect diversity. I - for example - had never heard of this 88 thing, and I would definitely not think about it at all the next time I create a username, and I didn't think it when I went to a barber shop that has that number in the name. Likewise, I wouldn't call anybody writing "Merry Xmas" tone deaf for missing the reference to the X MAS of infamous history (and just recently in the news). For some people it's apparently impossible to see their culture as non-universal (at the cost of sounding stereotypical, folks from US have particularly this problem after decades of cultural hegemony).
for a party that’s steeped in all of the same memetic game playing, you cant ignore the dog whistles
This all happened before Musk/Bannon salute. Just to specify it.
Sure, it does. Which depending on what their goal is, may be perfectly fine.
They have always been actively almost exclusively on reddit (where they engage) anyway, they will keep doing so I assume.