From what I gathered from this site, one would freeze precip dmt after the naptha looked "cloudy."

What if swim's naptha never got cloudy?
I'm told it's been a strong yellow color from the get and that it may already be dropping crystals
at room tempurature.. Would that be a valid point in time to place it into the freezer?

There shouldn't really be any visual change after pulling the solvent. It may turn yellow after pulling some oils from the material, which in case may or may not precipitate at room temp. However the naphtha should be ready, sit to freeze with snow globes precipitating over night.