Before releasing moddification of tools, you should do more proper tests yourself instead of letting the users do the tests and brick their consoles in your stead.
If WUP Installer has a white list, that's not to prevent piracy but to prevent users bricking their console.
The "non free" games on NUS will not come with the required cert and ticket, you can't install a game you didn't buy.
Some titles on NUS are free and comes with the necessary files and certificates, these one can be installed, but don't expect full game you didn't pay for.
People should do proper tests before releasing tools and telling users what they can do when it's clearly not correctly tested.
I hope nobody will brick their console. at least, WUP installer seems to give an error instead of installing bad data. You should be lucky.