I think including any reference to Archer like this is a mistake. How long is Scotty supposed to be "exiled" anyway?
As much as I hate to start another canon spitstorm, there are inconsistencies. From Memory Alpha:
For the biographical display seen in "In a Mirror, Darkly, Part II", writer Mike Sussman wrote a final section of text that didn't end up being visible on screen, stating that Archer "...died at his home in upstate New York in the year 2245, exactly one day after attending the christening ceremony of the first Federation starship Enterprise, NCC-1701". Note that Sussman himself has said this information might not be canon.
If it is canon, the wisdom of including of Archer is questionable at best. If it isn't canon, it's still a reference to a failed series. It would be best forgotten in this context.
That said, the article I read only referred to "the Admiral's dog," not "Archer's beagle."