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.
Check the source code. The real premine is 0.1%.
Check the explorer, first 10 blocks were 50k each
ExplorerEDIT: I edit from 5m per block to 50k as the explorer changed it's mind and I thought I'd misread when I checked my link and saw 50k.
Even more concerning that the explorer's changing itsmind. I took a screenie first thankfully (just to back up the wallet info guys)
Screenie