Phosphate is an ion, lithium is an ion, etc. Lithium ferrous phosphate (LiFePO4) is every bit as ionic as Lithium cobalt.
A123 should know that "lithium ion" is widely used by people who have no idea they mean "lithium cobalt", so it's a bad idea to use it with these cells that are presumably LiFePO4, but it isn't exactly incorrect, just dumb.