Unfortunately, this is not true at all. Not sure who said this.
They may have meant that it has the same benefits in terms of giving you the admissions advantages of applying through Questbridge?
But the financial package is not the same at all. The Match package is a no-loan full ride, irrespective of the school. Some of the partner schools may come close to this in RD, but others absolutely will not. We have seen specific examples of QB students here, who have gotten into USC through QB RD and then discovered that the aid package was shockingly unaffordable. What you get, aid-wise, through QB RD should be predicted by the Net Price Calculator for the specific school. Run NPCs for the schools you’re interested in, and compare the results to the QB Match package. USC would be a good one to start with: USC Financial Aid : Net Price Calculator
It truly is worthwhile to apply in the Match cycle, even if you can’t find the full complement of 15 schools that you’re willing to submit a binding app to.
Is your twin also doing Questbridge?