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".
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".