It already says at the beginning when they were received (not mentioning potential others).
It's definitely unnatural to say again 'as allowed by the ones received in those months we already mentioned'.
I always wondered why you couldn't get all your subpoenas passed through an intermediary who is instructed to post about them before reading them.
It could be, it could also be that they were trying to communicate both the timing of the subpoena string and why they are able to talk about it, and there aren’t any others.