From the website:

How much does it weigh? The Hybrid PA Bag weighs 8.9kg but this
includes a laptop bag and an overnight bag which can be removed
and used as hand luggage rather than checking into the hold of an
airplane.

That's where I got my weight number from, that's about 20 lbs. The power assist does not come on for flat surfaces, only when needed, so it would have virtually no effect on dragging a bag on flat airport floors, except you would be dragging the extra weight of batteries, motors, etc that aren't doing anything.

It’s designed to work on sensors in the
handle and in the powered wheels using torque, not speed, so the
first thing to remember is ‘be aware of the ground conditions’.
On a flat marble surface the power normally shouldn’t come on -
the anti-gravity handle should be very capable of making that part
of your journey effortless.