I think there's some truth to what he's saying.
The state is unlikely to sanction something unless it believes that it will not threaten the state. If he means understands in the sense of believes, then I'd say the statement is true.
Think I'll go look at the article to see how means this.
edit -- ok, I read the article.
The rest of his answer to that question is relevant.
You can gauge the effectiveness—real or potential at least—of any line of activity by the degree of severity of repression visited upon it by the state. It responds harshly to those things it sees as, at least incipiently, destabilizing. So you look where they are visiting repression: that’s exactly what you need to be doing.
People engaged in the activity that is engendering the repression are the first people who need to be supported—not have discussion groups to endlessly consider the masturbatory implications of the efficacy of their actions or whether or not they are pure enough to be worthy of support. They are by definition worthy. Ultimately, the people debating continuously are unworthy. They are apologists for the state structure; in , try to convince people to be ineffectual.
Nonviolent action can be effectual when harnessed in a way that is absolutely unacceptable to the state: if you actually clog the freeways or occupy sites or whatever to disrupt state functioning with the idea of ultimately making it impossible for the state to function at all, and are willing to incur the consequences of that. That’s very different from people standing with little signs, making a statement. Statements don’t do it. If did, we would have transformed society in this country more than a century ago. Looks like he's correct to me.