It's weird that they would be so unabashedly open about it, on a dating app they made, right in the FAQ. Singling this one belief out, and not mentioning consequences for the app (nor denial of consequences), leads one to ponder several obvious subtexts.
Technological utopians have a well-earned reputation of leaning toward the Machiavellian. If making babies is mankind's first priority, that means many other values are of a lower priority.
Personally I don’t see anything wrong about wanting to add more people to the world, but I’d probably phrase it a little differently.