Wow, I think that medley ends up being a refutation of its author's claim. Maybe it's because I'm an Iced Earth fanboy, but I was able to instantly identify the song that almost every riff in there was taken from. I would be really surprised if I was able to do the same for many other bands. If we remove the line about the shredding solos, I think the description makes a lot more sense when read literally than it does when read as intended by the LOLing-to-himself author.
Yes, Iced Earth has an identifiable style. So do most bands. If there is an "Iced Earth riff", there is also a "Meshuggah riff", a "Darkthrone riff", and an "Opeth riff". If you step back a bit, the idea-stealing even spreads from just your own band out into the entire genre. There's "metal drumming", the "ska riff", or "country vocals". Pointing that out doesn't really tell me anything useful about genres, bands, or songwriters.
Neil