Those links aren't strictly true, but they do raise some damn good points - Linux doesn't swap until it's actually out of RAM, which is rare.
Readyboost for Windows, doesn't use SSDs, it uses USB flash drives. More importantly, it doesn't put the swap file on them, it uses the USB as a disk cache instead of system RAM (think of it as similar to processor cache, for your hard drive). This is very different, as even when RAM usage is high, the cache may not be used if there are little to no disk operations.
But as those threads have pointed out, under Linux, it's rare you're in swap. If you are, it's cheaper to buy more RAM in the long run, as it'll be way way quicker, and last a lot longer than the USB drives (which will get eaten though if you're hammering them with swap all the time)