They’re not prodigies. Few are. They have learned a skill of recognising chess positions through repetition.
Most of the time talent is not innate. In fact, pretty much all the time.
Through dedicated practise on the edge of your ability, you can become a grandmaster of anything.
For the record, chess grandmasters are still bloody impressive.
Just because mastery is achieved not given or “natural”, doesn’t make it not awesome. Mastery is really hard work. Which makes it even awesomer.