I'm sorry but isn't T4xx series 14" machines? Which is very relevant to the weight comparing to the 15 incher. Every MBP since the unibody design is 0.95" thic

I'm sorry but isn't T4xx series 14" machines? Which is very relevant to the weight comparing to the 15 incher. Every MBP since the unibody design is 0.95" thick(of course except for the new retina one) and the T420S is 21.2mm-26.0mm thick, how is it slimmer?