As I wrote above, it means that the role is permanent as far as anyone knows. It does not mean that you will permanently be doing that job. It means that, based on all available current information, the job will continue to exist forever.

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"?