Actually, if you check deep down in the list of installables, you’ll find that Gentoo still supports the even less capable i486 variant. A laptop from 2010 is positively a spring chicken compared to some of the things it can be made to run on. Itanium is only being desupported because it’s being dropped upstream by the kernel and other chunks of the toolchain (and the only actual hardware they had to test on died a while ago).