Bitcoin Wiki page in question:
https://en.bitcoin.it/wiki/BitcoinPaperWalletPlease see this thread for full details:
Why has my newly created Bitcoin address already been used?There is a preponderance of evidence that the site BitcoinPaperWallet.com is now a scam. It was sold in 2018, and since then, there are multiple reports of users having their coins stolen from addresses created by that site - see the linked thread above for links to forum posts and reddit threads stating as much. Since it was sold, although the site still makes references to their GitHub repository, no GitHub link could be found. The Wiki page still states it is open source (which is no longer the case), and links to the old GitHub repository which hasn't been updated in over 2 years -
https://github.com/cantonbecker/bitcoinpaperwallet.
The Wiki pages should be updated to reflect these developments, for the safety of users reading it.