A bit odd to see punk genre's included, and for sludge to be so far away from hardcore punk. Also seem disconnected, which wouldn't be right since sludge is often described as doom metal + hardcore punk (although their have been plenty of bands with other influences as well)

Black metal is shown as a branch of hardcore punk when the description clearly states that it is a branch of thrash (And is obvious to fans of BM and metal in general.) Though many black metal bands have incorporated punk elements into their work, e.g. Darkthrone's F.O.A.D.