then there is no point in using that is not 100% and as you said it, this site is never seen around here which means the chances of it being reviewed and bug-free is low.
in that case it is a lot safer for a newbie (which most probably don't have much) to create a web wallet with 2FA or a desktop wallet with a good password encryption than using an not-well-known service.
besides why do anyone want "multiple" paper wallets? just go on a live offline linux and install literary any of the known bitcoin clients that let you export private key (core, armory, electrum,...) and print the private keys on a paper!