While I don't doubt the "stitched front pouch" of the trunks works as intended I think the reason it hasn't gained wider popularity is because of limited demand.
A proper fitting (meaning snug) brief should provide enough support for active swimming.
That has certainly been my experience over the years. I have found a brief with 5cm or less sides makes a nice v shape providing support for my package.
Most guys who want support just go and wear a brief.
While I don't doubt younger boys with there "speedo issues" would go for it that may be the extent of the market.
Their website certainly gives the impression that the intended market is boys who are involved in water sports.
Good luck to them and I hope the idea works anything that gets boys to try tighter swimwear is fine by me
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