You can make commentary on our humanity without it being strictly our timeline. Alternate, for this purpose, being the "What if?" of speculative fiction (Sci-fi and fantasy).
"strict" is the wrong lense to watch Star Trek through anyway - no matter if it comes to science, internal logic or canon. You will always find contradictions. As such, a few predictions retroactively shown to be wrong really should have no larger impact on what the show is supposed to be about.