root access - Install PIT File on Samsung S8 SM-G950F

I try to root my phone but now I get the error Failed to mount '/preload' (Invalid argument) on practially every operation in TWRP, so I read that I should replace the PIT-file with ODIN.

Is this source trustworthy: https://zfirmware.com/download-samsung-galaxy-s8-g950f-pit-file/