Went to the site, but video is no longer available.
But we do encounter problems in fleet cars at times much like the symptoms you have.
Higher idle speeds and doesn't seem to want to "settle down"
Can be caused by several events - much like what Toyota encountered when it had the pedal stuck condition - only to find out it was some operator error - floor mats and debris - while other incidents were from the recoil mechanism that pulls the pedal back up from the floor - over-spun and the substrate or composition of the rheostat (that variable potentiometer used to determine throttle angle) didn't have a redundant check to validate and prevent the system from over-revving due to the overthrow of the wiper arm in that rheostat sending a value that made the pedal look like it got punched to the floor or worse, the arm and composition failed to give a good clean response to throttle to angle changes so the system hung up and stayed at a value until the pedal can be re-zeroed out.
This "zero-out" normally would occur on start up and should also be temperature compensated and the re-calibration has to take place when the engine is first started not while your in gear and driving. This type of predicament, and no way to keep control of the vehicle when you have to shut off the engine to restart it - is what makes this dangerous.
The system needs to have the Accelerator pedal position sensor possibly replaced too so the re-calibration process it goes thru, it sees a new idle end-zero point to reference to - crappy construction and overzealous springs be (gosh) Darned...on start up and stays stable. So a new pedal may be needed too.
So check your floor mats, not curling under - make sure the wiring to the APP (Accelerator Pedal Position) Sensor is clean and no nicks and it's connector is properly seated. Might need to make an ohmic check - the grounds also need to be checked at that thing - for there may be a grounding bond point behind it at the firewall to tie a bunch of ground wires returns together to a bolt by and behind the brake pedal. IF the bolt has rusted or the wires are backing out of it - this make the condition serious.
So to me this may be just some floor mats in the way onto a more serious problem of a Ground point issue and loose wires causing the pedal to show differences in references (supply to ground relationship to where the pedal is and where the system thinks it should be)- which the system can think your lazy on the pedal while your not even touching it.