He specifically addresses audio engineering (which can be interpolated to DJing and remixing). As he says, what you need in that case is 24bit audio to have more dynamic range to play with. >48kHz is still useless to human hearing.

This particular article doesn't touch on compression as well, which is probably the biggest thing for remixing or DJing. You really want uncompressed or at least high-bitrate AAC.