Seems like the sort of story the owners' side would leak to make the players look greedy and show how much a young star can pocket, if he's willing.
It's a hard offer to evaluate, because it's hard to value the 'insurance value' of the deal, which protects the player against serious injury over the next 3 seasons as well as protecting him from the pitchers figuring out how to partially neutralize him, which would reduce his performance and value when he hits FA.
Looking just at what one is buying, this seems a significant discount from the Harper and Trout deals. Perhaps the insurance value is high enough to justify that. The Tatis contract suggests that the insurance value is that large.