The fast generation of PoS block is still ongoing, about 55 out of last 60 blocks, and in the amount of 250/500 PPC, so I presume it's the same person.
This is me. It's a wallet I created by sending approximately 250-500 PPC every 5-10 minutes over the period of a month. The actual amount and time depended on how much PPC I had available. I kept this running on a 24x7 node and it averaged about 150 blocks immature constantly after about 40 days. The machine it was on had a hard drive failure and it's been offline for a week or so. Having recovered the wallet from backup I've fired it up again and I guess it's catching up. For the curious the ppcoind node this runs on uses about 80% CPU idling - I assume that POS stack code takes a bit of CPU while cycling through so many transactions.