What is exploitability?

What is said

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1. 0:00Every solver is wrong. The only question is: by how much?
2. 0:05Imagine a perfect opponent. They see your whole strategy, and punish every leak.
3. 0:09What they'd win from you, as a share of the pot, is exploitability.
4. 0:13Five percent is rough. One percent is usable. Under half a percent is tight.
5. 0:19And every step closer costs more time than the one before.
6. 0:22So don't trust a solve that claims to be perfect. Trust the one that tells you how far from perfect it is.