Nope. The US parts in the EF are not critical. Kill switches.. you made that up.
no confirmation of kill switches but when EF and Rafale's sensitive parts come from US chances are they have bugs or even kill switches.
a sample list of US made parts on EF
Hexcel Composites: Carbon Fibre: Carbon fibers, structural adhesives, honeycombs, prepregs, sandwich panels and reinforcement fabrics
Excalibur Systems, Inc: Printed Circuit Boards: EXC-3900 interface board for avionics test and simulation applications
HiRel Connectors, Inc: Electrical & Electronic Connectors: Connectors, removal crimp and hermetic solder contacts
PEI-Genesis: Electrical & Electronic Connectors: JN1003 multi-pin circular connectors
Goodrich Interiors: Aircraft Exterior Lighting Systems: Dual colour strobe lights, landing/taxi lights, LED navigation lights, power supplies & cables, Aircraft Exterior Lighting Systems: Anti-collision lights,Cabin Signage & Displays: Indicator & exit signs
Parker Aerospace - Stratoflex Products Div: Disconnects: Hydraulic ground service quick disconnects
Device Technologies Inc. Plastic Grommets: Spring-Fast wire protection composite grommet edging
Goodrich Sensors & Integrated Systems: Sensors/Transducers: Pitot probe; ice detectors; air data total air temperature sensors
API Delevan Inc.:Inductors: Surface mount inductors
Eaton Aerospace, Fluid Conveyance Division: Fluid Conveyance Systems: Pumps, valves, level sensors, pressure switches, refuel/defuel manifolds, and couplings
PTI Technologies Inc: Hydraulic Filters: Filtration systems
General Dynamics: Command, Control & Intelligence Systems: Armament control system; Weapons Countermeasures: Decoy dispenser I/F unit
Raytheon Company Missile Systems: Missiles: AMRAAM missiles; Bombs: Paveway IV weapon system
Ultra Electronics Precision Air Systems: Ordnance Handling Equipment: HiPPAG airborne compressor for missile infared seeker cooling & munitions ejection
Herley Industries Inc: Microwave Components: Integrated microwave assembly for CAPTOR radar
the list goes on and on
Rafale too has US made parts including radar components as well as targeting systems.