P1S PWM Values

https://www.petoi.com/products/quadruped-robot-dog-bittle-servo-set On the page for the metal servos it mentions a range of 500-2500. Is that the min/max PWM. When I try to figure it out myself I get something more like 1300-5k which seems wrong. I'm using 50 for a frequency and 16 for resolution. Is this not correct? Thanks in advance. ledcSetup(0, 50, 16); // 50Hz for servo

ledcWrite(0,  8000);