I'm not convinced there is a strong intention on behalf of the manufacturers of this particular machine to stop legitimate repairs and force one to buy a new one. If there was, Panasonic wouldn't have printed a user-friendly service manual.
I note also that in this document they call the screw a 'safety screw', presumable because its primary purpose is to reduce the risk of the careless and inquisitive from doing something silly to the machine that might result in a fire or electrocution.
If they really wanted to prevent dismantling, they could so easily have ultrasonically weld plastic parts together, or made a special fastener, not fit a internationally standardised one for which the tools to remove them are available to the world after 10 minutes on the internet. (….once Mr G has identified the system of course
)
Gerry