Ashlee Vance's biography of Musk (from a few years ago) had a fun similar story. Someone inside Tesla wrote a letter, I believe complaining about product defects, which was printed by a media outlet. Figuring that the leaker printed the letter at Tesla offices (i.e. likely didn't have a printer at home), Musk re-typed the letter in Word, found out exactly how many kilobytes a Word file with that exact text would be,…
I think anyone who wants to write potentially career limiting things should exercise basic common sense like not using work computers and printers, removing fingerprinting elements, etc.
In the future I expect more to do stuff like cut and paste between programs to alter the font and spacing before sharing.
Or, of course, don’t leak proprietary information. There are whisleblower protection laws for illegal material that can be revealed. But leaking random company stuff, I think leads to less info being shared by the company to employees.