1. Why is Irfan156's name in yellow and the rest in green? What do the colors mean?
Each user gets a random color so you can scroll up through the list and see differentiate them more easier. It doesn't mean anything.
2. Why does it say unknown title above the posts? Did a search on myself and found that posts from July 2020 and older show unknown title.
Because I don't know their titles. I'm currently running a script to get most of them. For example, satoshi's first post already has his title showing up (it didn't before):
https://ninjastic.space/post/28