I don't think it's 5% premine. If I remember correctly the the initial OP stated 5 coins per block. Probably an error. But it's 5k per block. So I think 0.5% is correct.
unfortunately No.... can check urself!
Wallet -> help -> Debug console ->
type : getblock thentypehashnumber // u will see whole lot of info but this is the important stuff :
That's indeed interesting. Why is the explorer showing other values?