Ask that member that how long he drove his car?
My 2016 corolla 1.8 cvt is driven 200k kms. On a new transmission from 3000kms now, and ruined old one in a similar way which you're thinking of.
I opened axle for boot replacement on a hot car, It gave severe jerks afterwards, gave several noises, mechanics poured kixx, ran for next 20k kms and burnt out. Replacement cost: 380k.
Once cvt goes haywire nobody can fix it for you, and you will end up changing it ultimately.
Stop all experimentation on it, it's not engine. It works on principles of hydraulic pressure, and the fluid you're mainly pouring in acts as an hydraulic fluid. Slight change in pressure and it will go haywire.
No, you don't require any oil calibration. It's a Toyota deal it like a Toyota instead of a German.