They do link to his tweet where he stated that he changed his mind about the roll back, but they show no proof that messages were sent to mining pools with such proposals.
Well the discussion was obviously private but when there are multiple mining pool operators involved who are saying "they won't do it and it is not possible" that means they were discussing the roll back already. I'm just connecting the dots here.
Where did you read about the 300 BTC reward he offered for the reorg?
That I can not remember, it's been a couple of years now.