Though it would have been interesting to make it somewhat a mystery if Archer was just crazy, was being tricked, or if he really was in contact with a time traveler.
This is something that slipped into the Berman-era stories a little too much for my tastes. They'd have a good starting premise, but too often we the audience would know what was actually going on before the characters figured it out. They'd set up a good mystery to solve, and then give us the answer well before the final act. Even TOS: The Cage does it a bit, letting us see the Talosians before Pike is captured.