How often he actually did it. "8 of his last 11" means exactly that — he cleared it in 8 of the last 11 games on file. The count and the number of games always travel together, so you never have to guess the denominator.
How often the price needs him to do it. We turn the odds into the same units. "Needs about 5 of 11" is the break-even point. More than that and the price is generous; fewer and it's steep.
How much we trust it. Eleven games is not many. The bar shows the range his true rate could sit in — the wider the bar, the less we know. When the bar covers the amber line, it's too close to call.
That last part is the whole point. On this slate almost every line is too close to call — and a board that tells you so is more useful than one that pretends otherwise.