The people who think that ChatGPT will make knowing a language irrelevant are the same types who think you can "learn to code" in a couple months and suddenly be able to do everything an experienced developer can (lots of businessy managers). Or that by having wikipedia you know everything and that being able to read out a wikipedia article in a discussion is the same as knowing about something. Or that they can go to a foreign country with google translate and have real conversations with people.
In all cases, there is some shallow version that you really can do and claim success, but it should clearly be not real or particularly useful, and this is just another thing on the list.