This pen / pencil thing has been corrected so many times for so many decades that it’s ludicrous people are still bringing it up.

scientificamerican.com/…/fact-or-fiction-nasa-spe…

Random bits of pencil lead floating around in a high tech environment is such a poor idea that even the Soviet’s quit using pencils once Fisher’s Space Pen was available. A pen which Fisher itself paid to develop and then sold to both NASA and the Soviet Space Program.