Omicron did not exist 6 months ago; then it was the Delta that was emerging. And these “experts” think it will continue as-is a few decades from now, when the Delta is almost gone now
It actually may have existed in June of 2021. There are some people who claim that variants of COVID with the same or nearly the same set of mutations were caught in surveillance testing in June of 2021. one example
That might be a useful area of study for someone interested in variant sequence data analysis.