It would be bad if that specific note were deemed illegal, yes.

I don't think it's necessarily bad that it's hard to say you didn't write what you write.

Nostr isn't supposed to be a means to publish illegal content. It's not failing at doing that, it was just never supposed to do that.

The purpose of Nostr is to publish things so that it can be proven that you wrote those things, which is exactly what you may want if you wish to have a public outlet.