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The Enterprise crew didn't run into them & at that point they weren't a threat to the Martians who had more important things to worry about? Didn't they say they somehow survived the asteroid & developed space travel after it hit, then left? (or the writer forgot… ) memory-alpha.fandom.com/wiki/Voth

Yet another casual retcon from this writing team

I thought about that myself. I figure the decision was made to not mention them, just to not clutter things further, since it would have pulled away from the story’s focus. Maybe the Preservers were responsible for relocating them and showed up after the asteroid hit?

Are they the alien race from Voyager who the crew realised had originated on Earth from a Saurian origin and spread to the stars in the distant past? Because yes I wondered that too. I presume they looked at the arachnid race on the 5th planet and scarpered.

I mean, yeah, but we're dealing with gaps in time numbering in millions of years. There's tons of stuff they could say to fit things together if they cared to (which I'm reasonably sure they don't).