The member selects which Points in his/her account are applied to a DC reservation, and the confirmations for reservations indicate clearly whether the inventory has been pulled from the DC Trust or the DC Exchange Company. The data needed to debunk the sales-speak about "supercharged" points is in plain view and we've had ten-plus years of experience to collect and analyze it.
It is possible to "know for sure" that when someone tells you that buying Trust Points will somehow "supercharge" (or whatever other stupid word they use) your Exchange Points from enrolled/elected Weeks such that the total combination can be used to book inventory directly from the DC Trust, they don't know what they're talking about. It's very basic: Trust Members (owners of purchased Trust Points) have access to inventory conveyed to and available through the DC Trust and the DC Exchange Company; Exchange Members (owners of enrolled Weeks which can be elected for Exchange Points) have access to only the inventory available through the DC Exchange Company. That's what the governing documents stipulate and that's what the practical experience of using the DC supports.
I'm not saying that Exchange Members do not and cannot access DC Trust-conveyed inventory. They can, but not unless/until that inventory is moved into the DC Exchange Company. We have closely watched inventory machinations since Day One, because Marriott people had the same concerns about inventory mismanagement by Marriott that are being raised now by Vistana people. We've learned a great deal about inventory machinations over these years, and tops on that list is that sales reps many times have no practical experience with the DC and they misunderstand the DC nuances at least as often as owners may.
There's never been any indication, either, that specific inventory will be moved from the Trust to the Exchange Company on demand if/when a member who owns Trust and Exchange Points requests it (as opposed to that inventory not being moved if a member with only Exchange Points requests it.) The only evidence we've seen that certain inventory is held for Trust Members is that certain highest-demand inventory isn't moved from the Trust to the Exchange Company until the 12-months Reservation Window opens. It doesn't appear to have anything to do with any "supercharging" variables at work, but rather an effort to preserve Trust Members' access to highest-demand/lowest-supply intervals.