As the description alone could tell, this tag is used exclusively by 14-years-old 'metalheads' who discovered extreme metal a couple of months ago and want to look true and badass.
Metallica has thrash metal most of its stuff, whether early or latest. Tag is not "what they're now" or "what they were in 90's", but "what they're in History". Same is to CoF: symphonic black metal or gothic metal, it is still metal.