The Samsung Galaxy S4 has the same sticker and works with every SIM.
It's just that Samsung lacks focus and is incompetent at communicating with its customers and non Korean employees.
Probably some idiot manager in Europe decided to put this sticker on the case and they don't know about it (or didn't understand this) in their headquarter.
According to Samsung only S4s made after July 2013 will be impacted. It has been well confirmed that it isn't just a threat, if you insert the wrong SIM you get an error.
It's just that Samsung lacks focus and is incompetent at communicating with its customers and non Korean employees.
Probably some idiot manager in Europe decided to put this sticker on the case and they don't know about it (or didn't understand this) in their headquarter.