I have this philodendron patriciae that I need to root because it got root rot from shipping. Do you think it's best to separate the off stem from the chunky stem? It's hard to tell if the chunky stem has rot, I feel around and it doesn't feel squishy at the moment but i am not sure..I also saw one tiny white bug on the chunky stem which makes me worry if it does have rot. I really want to do this right...what would you do?

I have it in sphagnum moss, humidity is 90%-100%. The leaves have become more yellow recently, I'm guessing it's because the humidity was lower and the moss was drying out.

I would not remove it, I would plant the chunky stem. Those roots don't look bad. I would plant it up to the first eye on the small stem. These are hard to come by congrats!