IDM snagging a deleted vid sounds like a glitch in the matrix to me, heh. If you're serious about lost media, consider running your own archival system. Use Youtube-DL scripts to auto-download new videos from channels you care about. Keep ’em on a hard drive. Better safe than sorry!

lol or just cheat with the letters glitch if ur really stuck. makes it ezpz. but i guess where's the fun in that, right?