Yes but regardless of whether the rim is hookless, the problem described is as a result of the knob profile on specific tyres, which would mean either way, hookless or not, you'll see the same amount of rim strikes.Depends on the type of damage, but there is a lot where the hook is where the damage is - without the hook they are also able to make the edge of the rim slightly thicker and therefore stronger.
More likely however, is wider carbon rims have a widespread belief that you can magically run lower pressures without a downside. What this gives is more rim strikes on a brittle material. Don't succumb to the hype, run the same pressures that you always have - rim strikes on carbon are bad.
I just figured if a company as well established as syntace are recommending it, then there must be some substance behind it. That being said, i'll probably continue using minion DHR II's because they're so damn good.