You're probably browsing a different website and not knowing. Such as some outdated US variant of their site due to auto redirect where new products will be available later because US sucks to import to.
It's really not fair to compare 25mm thick fans to 38 mm thick fans. It's like comparing a fan that runs 1200rpm fan to one that runs 2500rpm and saying the 2500rpm fan has much higher pressure rating. If we were to test the 2500rpm fan's static pressure at 1200rpm it will likely be very similar to that of the 1200rpm fan .. but we can't even do an comparison of 38mm thick fanb to 25mm thick fan.
I think you have people mixed up here mate. I've not said anything is 'pressure optimized.'
Arctic claims it -- and it's nothing but marketing. The static pressure ratings on these fans are anemic. I'd imagine any restriction in the exhaust or intake path of these fans would result in a large loss in CFM.
I won't be giving up my SanAce 140x38mm for any of these "pressure optimised" fans.