https://en.wikipedia.org/wiki/Ken_Williams_(game_developer)
Basically, he moved across country with his wife (Roberta), because (somehow, IIRC the story) he got hired as a software developer by a company in California - but he had no programming experience.
So - on the long drive from where they lived, he crammed learning how to code from a book for the language (don't recall - maybe cobol or fortran, given the time period), and was able to show up, day one, and code for his job.
At least, that's what little I recall about the story. I probably have a few details wrong. Regardless, its an even more amazing story when you realize this was at a time when Ken would have had no access to a computer until he got to his new employer's office (at the time, desktop PCs were virtually non-existent, and laptops were but a dream of Alan Kay - at best, you had a green-screen terminal, if you weren't submitting card batches)...
Sounds like there's no misrepresentation at all. Most people treat it as to become delusional of their own abilities or qualities, so functionally they are just tricking themselves in addition to everyone else.
"Changing your mental state" can be just as harmful as outright faking and sometimes there's no difference in outcome at all.
A little knowledge in a bad mental framework is a dangerous thing.
My current work allows me a pretty decent look at literally thousands of different IT infrastructure set ups by this point only half a year in, and I'm still explaining the basics of IT administration, infrastructure, SQL queries, and so on to people with the title "Senior ______" and a list of certifications that adds a good 4 MB to each of their emails for all the banners.
Try not to worry about it, and don't enable them either. Be professional, but be firm. I won't promise that they will get their comeuppance or that you will be rewarded, but you can at least leave every day not having to look over your shoulder or double checking that you covered all your bases. In the long run, you'll have the knowledge to do what is necessary for future growth in your career, they will have to keep inventing new ways to fake it.