Because it is not plain Zerocoin.
Its like calling Zcoin, Bitcoin, because they use Bitcoin core. Zcoin is Zcoin because they added Zerocoin to Bitcoin Core.
Well, if you add Commitment Key Packs (completely different protocol) to Zerocoin it becomes something else...
^ This is an explanation for a 10 yo
26/28 posts in this nix thread, ladies and cryptoscammers bitro33's account was made for shilling nix