Wholesome is absence of passion? A person told here, that wholesome (kusala) means absence of passion (desire, will..., raga, lobha, chanda...).

Is that right? If, why. Is it wrong? If, why?

No need to have passion to answer the question, of cause.

(note: this is not for entertaining, trade, exchange or stacks that binds, but to get attached to liberation and for a leave.)
The way I understand, any action which benefits you and the other person or both are wholesome.