It's a good investment for the company, if the interviewer can red flag a candidate who is blatantly lying on his resumé because the candidate would assume no one would know said technology, it would save a lot of money from cutting ties with an employee in a later stage.

As an anecdote, I used to work for a company and would require candidates to know some Ruby, for one guy with several years experience in Python we changed the requirements of the home assignment so he could write it using whatever he wanted. he hands over a nodeJS application claiming he took the opportunity to learn something new(why not Ruby?), seemed like it was well done, so we bring him in for an interview, unlucky for him, there was one member in our team with some nodeJS experience(me), having reviewed the code, I asked him to do a minor feature addition to his own code, he froze, couldn't do it because he didn't write the code(copying from some repo) and didn't know any nodeJS at all, asked him to do it in Python instead and he still couldn't do it, he had just spiced up his resumé with tech we didn't use to see if he could weasel his way in.