Are you sure that's the reason? Might it not be for a lower freezing and high boiling point? The same can be achieved with an aftermarket brand with a 55/45 mix. For example, compare and contrast Mazda FL-22 with Peak 50/50 and Peak 60/40. Mazda's 55/45 sits in the middle:
www.owi.com
Judging from the Peak web site they no longer make an all-vehicles coolant. It is interesting that the Peak Asian Blue and Asian Green descriptions and specs are identical. The only difference may be the dye.
Frankly, the more I look at this the more I'm skeptical of any benefit with Mazda FL-22. Now, when the time comes for a flush and fill, a dealer will be doing it. If they want to use the Mazda coolant, great. If the want to use Peak Asian Green or a comparable, I'm fine with that too.
I'm reminded of those who swear by the Mazda branded moly motor oil which is non-synthetic and GF-5 spec. Would you better off with a synthetic GF-6, particularly with a turbo, given GF-6 was designed for improved protection in turbos? I think so.