The Slushpool FAQ is correct

 your reward = block value

Current block value: btc.com

Enjoy

All online calculators including the Slushpool one calculates on a basis of BTC block reward as current situation is not a standard situation. Anyway, go and school some kids that just started their journey with mining, i am in this for several years and i quite understand how it works, contrary to you apparently

You have a video that proves they just make arbitrary payments