Anatta means the aggregates are just processes, without owner or controller. And because there is nothing aside from the aggregates, it's ok to say there is no self anywhere. There is this sutta quote that says if there is a self anywhere, the Buddhist path would not exist. So, that says if there was an entity with control or ownership, the path would not exist. Because if there was control over the aggregates, we would just turn them as we like. Which obviously, we can't or we wouldn't ever have suffered.
So that's not meant as a strategy. Yes, anatta can be used like a strategy, but it's not just
a strategy. Just like suffering and impermanence are not mere strategies, but realities of existence, so is anatta the Buddha's answer to the big questions in life. Dukkha, anicca and anatta are the same thing. As far as I've seen the discourses, they are treated identically. Not one as a technique and others as a reality.
I know this is in the pali forum. If you expect an answer based on pali literature, I'm sure many things can be found - but don't ask me.