I saw the video. Don't know what's happening but the bar showing the CPU Temp between ranges of 50° - 75° fluctuates a lot. If it really is the temperature of the CPU, why would it fluctuate so quickly. It might really be something else.
Ive open at the case behind , somehow my asus rog 2phone 1TB , there is alot of glue, covering the heat dessipation plate, and wifi or gsm antena and cleared the glue, and also taking advantage to intall graphite thermal sheet to desipate n distribute the heat to wider area,by using thermal camera to identify the hot spot ( using 3d mark for gpu and cpu trotling software (for cpu). Becafull when opening the hood. There is small metal sponge act as thermal bridge to the metal grill. Once done ive seal using the phone glue, and run as usual and i can play cod mobile , in extreme x mode setting and max cod setting without using fan, room temp 28-30 phone temp 43-49 without cooler fan, due if have distribute the heat to back cover,the game was played around 2-3h nonstop. Sorry i dont have pic or proof , ive only have this phone only