Yes, he means european notation, where C4 equals C7 in american notation, i live in europe and i know that. I think 7-th octave singing is way too much, there is no need to go that high for anyone.
Realy impressive voice but not quite right performance of the song in my opinion. You have to remember, that it's a half-preyer and half speech to a father, and mostly it doesn't sound like one, but sometimes you get the point, but rarely comparing to the lenght of the song.
i don't kmow how to say it correctly... Well, did you listen to those tracks before posting them on youtube? Is it possible that you can hear yourself well there? I listened to two tracks and i decided that there is no reson to listen no others, if you know what i mean... May be you should do a better quality recording and then post it here for everyone to listen, because what i heared there was: 1)bad quality(i can barely hear you) 2) bad singing(by my opinion of course). For me you sound all strained and tight.