Just for reference, while it has been edited, the comic is by Stan Kelly, The Onion's resident cartoonist. Kelly is fictional, a satirical stereotype of a right-wing newspaper cartoonist. His signatures are over-labelling everything, gratuitous self-inserts, and framing the wealthy/other advantaged groups as morally upstanding patriots unfairly victimized by their inferiors. The latter is usually accompanied by them crying a single tear.

All that to say, in the context of a Kelly comic, "Honest Tesla Salesman" is definitely meant ironically.