Except permanent jobs are frequently made redundant and cease to exist. The original intention may have been for the job to exist forever but things change, and permanent things cease to be so permanent. Much like countries...
Of course, people can and do make mistakes. The fact that someone chooses to use a word to describe something does not mean that it's necessarily an accurate description. They may be lying, or they may simply have judged the situation incorrectly. How many startups say "we are the next Google"?