Flexible battens would be a nightmare as soon as the wind got up. This was one of Robin's ideas back in the 80s that didn't work that well, to be honest. However, if you rummage around, you will find quite a lot about articulated battens, particularly recently, and this would be a way around the issue, without the trouble of making a new sail or adding camber to the existing one.
The photo of the partners shows no apparent reinforcing, apart from a wee bit of blocking in the immediate vicinity: maybe it's on deck? The photos show the boat sailing in very light airs (and why not? Certainly my favourite conditions), so possibly the boat has only been used very lightly.
FWIW the chain comes into a space that doesn't appear to be watertight. I am a tad averse to water in my boat, so this would not appeal to me.
Apart from these quibbles, I'd say a pretty boat and good value for money. I leave it to the experts to comment more technically.