From what I know and understand Sons will field teams and supplement their coaching with some NXT clinics, coaching, etc. After 8th grade the kids will then have the opportunity to play with NXT full time. Just like every other team at most of the pre-HS levels, there's a tryout for that team as well.
Will all the Sons kids make NXT? Likely not. But the lower level NXT teams are not that competitive so you can do that math.
My son will be at the Sons tryout. Good, solid program with good coaches and kids. And no, this isn't the "founder" or current team member dad.