https://www.cnet.com/news/beware-fake-120hz-refresh-rates-on-4k-tvs/

Think you're getting a 120Hz TV? Hold up just a second. You might not be. 

Many TVs today are 60Hz, despite having "motion rates" and "effective refresh rates" claiming much higher numbers, including 120, 240 and more. TV companies are deliberately hiding the actual refresh rate from you, and it's been going on for years.