Mostly correct, particularly with technology companies. This is why patent trolls are so bad for the industry. They have an arsenal of patents often bought from some now defunct company, but have no actual products they need to protect.
But the particular examples I gave are in fact patented, protected things and the sort of thing these companies feel are worth protecting. Ford's
weird tailgate step is in fact patented and GM had to come up with their own slightly different weird tailgate step to combat it. Ford also has patents for the frunk on their F-150 as well. Musk describes this as landmines to prevent people from following and he's 100% correct.
As I said above, none of this really protects them and giving Tesla access to their tailgate step or their
keypad entry system won't harm their underlying business. But you'd never convince Ford's C-Suite that it's worth trading access for those to get the Tesla charger.