That is likely true in a lot of cases, though static weights and swing weights have been plummeting in recent past, so specs that are closer to stock weightings wouldn't be surprising. Regardless, those frames are still being used as platforms, and effective platforms at that. So the OP doesn't necessarily need to switch to something higher-weight in stock form, much less so a thin-beamed flexy control frame. If he really thinks he needs to, he can simply add a bit of lead, while holding everything else he's already used to at a constant.
The Speed MP is a cross between a control and power frame. The current iteration is about 60% power frame, 40% control frame.
And yes, Sinner uses the Speed MP, though his is a previous model (Graphene Touch Speed MP) with a thinner mold at 22mm thick (versus the current Speed MP at 23mm), different layup and different drill pattern. But apart from that, yes, it's the same silo model.