ESEE differentially hardened?

[Shotgun]

So I was perusing the dealers in the exchange and I noticed this on Molly Survival's website about the esee 3.

After noting improvements offered by soldiers and cops in the field, they took the popular Ontario/RAT RAT-3, added 3/8" of handle length, a glass-breaking pommel, larger handle screws, then differentially heat-treated the 1095 carbon steel and dressed up the Micarta slabs to build the ESEE Knives 3. We then coupled this improved model with a sheath system (included with any ESEE-3 purchase) that can be carried in just about any configuration for the perfect, lightweight carry knife. The ESEE-3 features a substantial upgrade in overall fit and finish, as well as lined gray Micarta slab handles and a Super Tuff black textured powder coat on the steel.Note this knife does NOT include the MOLLE back.

Is the 3 differentially hardened? Does that go for the 4 as well?