> ”It's being sold in two modes. One with cold gas (no combustion) … and one with real combustion rocket engines”

No, both versions use cold gas thrusters. There are no combustion rocket engines involved here.

The difference between the “thrust” and “rocket” versions is the number of thrusters: “rocket” has additional thrusters that enable it to fly. The “thrust” version just has them at the back for acceleration.