The P&Ds are common with thinly traded premined coins.
The altcoins have done a fair job of sweeping people with zero scruples away from Bitcoin. I'd be quite surprised if this were someone trying to drive up the price of Bitcoin.
Now I'm not saying that the OPs theory about this being a pump and dump is likely correct. But I don't think it is any more speculative than the other ideas offered here (jilted ex / copy&paste error / testing code that mistakenly shipped / etc)
And they're also talking about parties controlling 1000 BTC levels... which, while an astounding amount of money, are still small compared to the markets.
I can't say it's impossible, but I'd rate most of the other speculation above it.
Then again, nothing stops someone from trying something that won't work...
If this is a pump and dump scheme (and that's a big "if") then they would need an order of magnitude more than 27BTC (ie the amount they sent to this wallet) for this to work.
I'm not saying it's a good idea, but it's not unusual for pump-and-dump schemes to involve burning a lot of value to trigger the pump they're trying to profit off of. You need to treat the bit they're planning on dumping as separate from whatever capital they're prepared to invest to make the pump happen.
Now my wife’s musings about crypto dog yesterday are far more meaningful.