… Why would there be a template or version of an existing document specifically dated to … the previous day?

As opposed to … just a blank date field?

You know, a template?

Did something else happen on the 9th, that required a document of this format to be drafted up?

Also… how often is such a template used, for a pretty uncommon, special statement to the general public, actually used?

Probably not very often.

Your argument is not very good.

You’re layering in a bunch of assumptions, adding more complex conditions that would have to be met, you know, the opposite of doing Occam’s Razor.