I'd guess he lost the playoffs for the final place in Masters week with the other players who'd collected 4 circuit points up to that stage.

I think you might find that he gets his entry point anyway. I know lots of people think that you have to play in the Masters week of a Satellite series in order to get any of your circuit points converted to entry points, but the only official rule about it that I've ever seen written down is that you have to have won at least one match in a main draw in one of the weeks, which Yoann did last week. I may be wrong though.