I doubt there will be any checking of names, passports, etc at the stadiums. It's just not practical. The Fifa site says something like they are "entitled" to check, not that they will.
Plus, despite all these measures by Fifa, I suspect there will still be lots of scalping/touting of tickets in Germany. If Fifa then decides to enforce this "rule" to the last man they may well end up with half empty stadiums.