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Of course not. What changed hands was Steemit, Inc company stock. That transaction did not happen on any blockchain.

He means the pump from the hype on the exchanges, but it would never be large enough to dump 70 million on.

Absolutely not.

That depends on how much he bought that steem for, and how much he may have accumulated in advance. I wouldn't underestimate the Justin Sun hype machine and its ability to pump.

dumping 70 mil is a lot, considering that a pump can be caused buying a few hundred K

Well I think we can agree either way that they will want to extract value from those tokens, which means if you have some liquid steem, you could be in for some highly profitable trades.