Even so, I doesn't make sense.
So ... the i5 for laptops are i3 with Turbo Boost. Whoop-de-doo.
Every CPU and GPU manufacturer is doing this very same misleading marketing crap. AMD's mobile APU/GPUs are one spec step below their desktop counterparts for the same general model number range, Intel's mobile CPUs are one step below their desktop counterparts for similar model numbers, Nvidia's mobile GPUs too.
Bringing unnecessary confusion to the market by reusing higher-end desktop model number for lower performance mobile parts is a standard practice. Gotta love how model numbers represent the "relative value of parts within a given market segment" rather than the relative performance across all same-generation/architecture products.