all of your experience? We talking months, maybe years? because I measure my time in decades. If you think "no one is confused" you are either lying or don't read any of the articles of the past 20 years outside of the community.
For something to be libelous, it has to be untrue.
I have not given it any thought.
No idea why Bengston changed his business name, ask him? I don't deny that having the name "DeLorean" helps to better identify what the business does, but I have never seen an article even implying that DPI has any connection to the company started by John DeLorean.
Bengston, Steger, Peterson, Bernstein, Lore, or anyone else who has used "DeLorean" in their company name did not call themselves "DeLorean Motor Company", and never claimed ownership of the intellectual property they did not buy or create. None of them collected royalties from Universal Studios, Nike, Target, Microsoft, etc. They for sure did not sell the name to a new company for the purpose of making a new car! The comparison is (at best) grasping at straws.
Spec 1,2,3 or even Stage 1,2,3 etc. have been around a very long time, and used by many automotive performance shops. Or, are you claiming DMCH invented that terminology now? Maybe they should have registered it with the USPTO. If anything, Bengston using "Spec" vs "Stage" results in DIFFERENTIATING his products from DMCH. He could have just as easily used the same terminology, but that would have been confusing.
Sorry, I don't know who Matt is.