3. I'm mistaken. How?
The original software is far slower than you give it credit for... I benchmarked old openssl code on a contemporary P3 a while back and got about 47KH/s as I vaguely recall. Why don't you go test it instead of making guesses from comments.
I would also not assume that the timestamps on the pre-public blocks are accurate all we really know for sure was that there were at least two blocks created between 03/Jan/2009 and 11/Jan/2009. Rounding that down to 7 days suggests a lower bound hashrate of 14 KH/s. Even if Satoshi had more computing power he might have simply been borrowing it for testing.
I'm with you that the OP is off on his assessment... but in what way was a P3 "contemporary" to any period of Bitcoin's history? I have a stock 3.2 GHz P4 purchased from Dell in 2005. Prescott core, so a "later" model P4. It can do > 1000KH/s, and it was already obsolete by the time Bitcoin came around
four years later. Hell, the Core 2 Quad Q9550 came out in Q1 of
2008, and it easily gets well over 10 MH/s. I'll grant you that the old client was poorly optimized, etc... But P3's were long obsolete even by 2009 standards, so it's rather misleading to claim those results as "contemporary".