Not even remotely.

What I said is that I share a trait with about 25% of the population, more in software, where I can't do my best composing if I'm narrating at the same time. By "time", I mean 30-120 seconds without having to speak.

In actual development that doesn't matter: pauses to compose an answer are fine in conversations and most work time is individual anyway (even in open offices).

I do note, however, you didn't actually answer my question: in what way is whiteboarding like real work deadlines?