Earlier quoted context omitted.
Their claim is complete horseshit. They must have decided that including the previous game library was not worth the development effort of an API translation layer. Hope they're right...
Some games presented the Dual Shock 4 controller visually tracked in game, even if they managed to do a compatibility layer those games still relied on tracking the DS4 controller light via the camera. But at least some devs have confirmed their psvr games will be patched to support the new version, like No Man’s Sky.
Their support of that game has been very impressive over the years. Launch was rocky, sure, but they recovered and kept pushing ahead.