Tertiary oppression refers to when people remain silent in the face of, and benefit from, oppression by others

The statement is "False".

It actually is referring to the act of Secondary Oppression. Tertiary oppression is executed by individuals from a persecuted gather when they look for acknowledgment by supporting the predominant party's onerous demonstrations. For instance a minority-group member may oppress kindred group individuals to get support with prevailing group individuals.