The Redmi K30 Pro certainly has plenty going for it, but a high refresh-rate display is not one of them. The regular Redmi K30 does though, to confuse matters more. The general manager has now explained this decision.
https://www.notebookcheck.net/Redmi-GM-explains-why-the-Redmi-K30-Pro-only-has-a-60-Hz-display.458955.0.html