Definitely a Horizon custom because of the carve-top and the recess contouring on the lower horn. Plus, mirage and MIIs are not carve-tops, which the guitar in the video definitely is. As for the headstock, ESP would easily have put that headstock on a custom guitar... I know first hand because back in the 90s I ordered a custom mirage and that reverse headstock was an option that I was sorely tempted to go for.