I found it REALLY weird what how Ford calls this a Mustang too. Everyone just seems to be using a popular brand name and slapping it on stuff just to ride the familiarity.
You can blame Mitsubishi for starting this by dragging Eclipse back out of its grave in 2017 to slap a name on their SUV. Then Ford pulled the Mustang Mach E stunt like you mentioned, and with those two the floodgates opened. Now we have the RSX and once there’s a Corvette SUV we will be in the end times… lol