That's not the standard definition of racism. You're repeating a variation of "racism = prejudice + power", a component of the social justice meme I've been seeing everywhere.

To me it seems like rhetorical sleight of hand, redefining "racism" to depend on a mysterious "power" component which is never adequately demonstrated or explained, or only explained in terms which are themselves actually racist, e.g., "whites have power because most politicians are white".