About your gripe with use of the word impossible: it's a quote. Most of the quotes are like applause-lights.

Yes, it's an applause light. It isn't one that made me applaud. It isn't a rationalist quote. It doesn't belong here.

Just mentally replace 'impossible' in that sentence

No. I instead choose to mentally replace the quote entirely with a better one and oppose this one. Even Nike's "Just Do It" is strictly superior as rationalist quote, despite being somewhat lacking in actionable detail.