At the very least that's a remarkable assumption. We've been doing this for essentially ever, and it impacts all kinds of stuff. In some sense, musk is to CEO's what trump is to the presidency: all that diplomacy is just nonsense.
And - perhaps there's a kernel of truth to that; after all, the way we communicate has changed more radically than I think we really like to admit. I don't just mean the technology and the means, nor the social fashions: just read (transcripts of) old communication: I think we really think differently now than a few generations back. So perhaps old norms no longer apply completely.
But I'm not quite willing to assume that without at least some careful thought. I think it's at least as plausible that trump and musk (to be fair to musk: they differ in most ways, and trump is way more extreme) simply don't communicate very strategically at all. Despite all the hot air there's little upside; it's mostly mess.
Sure, it's entertaining. And as entertainment, that's fine. But would you want to actually deal with people like that? And if the world has changed in many ways, what hasn't is that you're going pretty much nowhere alone. You need cooperation and help to amount to anything constructive.
So: maybe there's a small chance this is the new norm and humanity has changed in pretty basic ways under the influence of todays pressures and technology. But there's also a considerable chance it hasn't.