Yes I think that's a reasonable definition of pre-emption because they don't interrupt the numerical pipeline. They cause zero data or control dependencies. But even if you don't think it fits the definition, what do you think the practical difference is when you argue about this terminology?
What did we want to achieve? We wanted to be able to run a tight loop of highly optimised, untagged numerical code but still be able interrupt it to switch threads on demand from user-space if needed.
