Zcoin.rocks is a fan-made page. It was created some time last year and I think it's no longer maintained (hence the dead links)
You can still use it as Zcoin's keys are still the same (and all a paper wallet generator does is generate a pair of private/public keys), but a newer generator can be found at http://paper.zcoin.ga/ (also not official, and currently without HTTPS, so use at your own risk)