Earlier quoted context omitted.
Solvable yes, but it's a perfect example of it not being solved yet despite this person's anecdotes. Engineering problems aren't limited to a single solution anyhow. Anyone ruling out a camera based solution has very little imagination.
Unless it’s a mathematical proof, solved usually means works in the overwhelming majority of cases. It’s solved for all intents and purposes.
If that's your definition of solved, be my guest, but it's a pretty silly one.