My two stems are like that too after 8mos. use and I always dry with a clean white microfiber cloth for any paint debris have not found any to date as well I check MPs with paper towels and nothing there. My theory is flecks are either down the sink when I rinse or in the iso bowl it soaks in - hard to tell iso is dark. Where the Ghost MV1 had giant flecks of shiny material that stick to towels, this seems for me to be more wearing and rubbing off.
So that’s my experience take if for what you want; I’ve learned the vaping industry has had mostly misses when it comes to devices and coatings! And by no way am I saying do or don’t contact Tafee; make the decision for yourself!