Aside from the cool factor, one commenter on the thread is skeptical that this actually erased the data:

This isn’t as secure of an erase as most of you think I’m afraid… All this did was de-plate the metal from the back of the disk. To securely erase it, you’d need to try and slow the process down a bit, give it an opportunity to develop enough sustained heat to also deform the disk, as depending on the method of writing data to the disk, it may still be there. As it stands, there’s a good chance you could simply re-plate the back of the disk and recover some (if not all) of the data. The aluminium layer often only serves as a reflective surface for the reading laser to reflect back off to be read after passing through the plastic layer where the data is actually stored.

What do you think?  Of course we would not recommend using this technique if you wanted to keep data secure.  Although we’re quite pleased to watch awesome sciencey stuff like this on video!