> Yet a nationally representative study of 1,000 British adults, with which I assisted, found that 75% of British adults thought “scrum master” was a fake job title, or didn’t know for sure if it was real.

I think this bit misses the point. "Scrum master" is pretty descriptive and explicit if you are the least bit familiar with Scrum methodology. Unlike the other examples which are intentionally obscure and playful, this one is only obscure if you're unfamiliar with the specific industry.

I'm fairly certain there are perfectly legitimate job titles in other industries "75% of British adults" aren't familiar with. That's okay, they don't have to be.

If it was "75% of British technical project managers", I would be far more concerned. A job opening for a "Scrum master" likely isn't an entry level position for someone with no prior knowledge of Scrum -- and if that career path is interesting to you, you'll likely already know what Scrum is.