multiple injection: sending the same proto-article to multiple
injecting agents.
reinjection: taking a netnews article, converting it back into a
proto-article, and sending it to an injecting agent.
By those definitions, he's not doing multiple injection because they're
mutually exclusive. (Well, unless his conversion process recovers exactly
the same proto-article as he had originally, which one can do with care in
a local news environment that's under one's complete control, but which is
not horribly interesting in the general case.)