The group promoting the SL16 has basically been given 2 years to prove their claims made in their press release.

The ISAF Youth Championships must be held in a ISAF Recognized or International Class. The SL16 is not an ISAF Recognized nor International Class. The Hobie 16 is an ISAF International Class. Therefore, the SL16 cannot be used for the ISAF Youth Championships at this time.

The requirements for becoming an ISAF Recognized / International Class are here.

The SL16 does not have the numbers nor the geographic distribution to qualify yet, so even though it has been recommended as the "equipment of choice", it cannot be used until it meets the additional hurdle of becoming an ISAF class.