The tracert (trace route) command is actually a basic diagnostic tool used by IT professionals to see the path data packets take across routers (hops) to reach a destination.
While the original channel is long gone, the videos are still archived across the internet as a nostalgic reminder of the "wild west" era of YouTube tutorials.
Nextgenhacker101 became the poster child for the —someone who uses basic tools they don't understand to try and look like a master hacker.