I agree with this, however I’m not sure where the idea of refusing labor as not a form of violence comes from. The WHO describes violence as “the intentional use of physical force or power, threatened or actual, against oneself, another person, or against a group or community, which either results in or has a high likelihood of resulting in injury, death, psychological harm, maldevelopment, or deprivation” and refusal of labor as a political tactic definitely falls under the category of “use of power, threatened or actual, against another person, group, or community, resulting in deprivation”.

That falls cleanly in the realm of a violent act, unless you disagree with that definition of violence, or my interpretation of the quote. I suppose you could interpret it as only applying to physical violence, but I don’t think anyone would agree that psychological or emotional violence simply don’t exist.