*Highly* doubtful.
BTC was being worked on long before it was first released to the public. To that extent, it's taken well more than a decade to get to where we are now. Add that to the fact that the vast amount of BTC known to be mined by Satoshi is unspent, and it all points to BTC being a legitimate project with a long-term scope.
The fact that Satoshi's btc remain unspent, proves imo that it wasn't initially created to be a "pump and dump".