The fact that it's coming out on a proper album fully supported by the Estate is a start.
Do you think Mike's family would allow an album of fake material to be released? The only people who are twittering about it are the ones who have absolutely nothing to do with any of the songs and have possible vested interest in certain tracks being taken out.
If they are so concerned and love their uncle why don't they stop with the guerrilla warfare and take the matter to courts already? What are they waiting for?
The onus is on people who are saying they're fake to prove it. The defendant defends only when the prosecution has a case. Where is the prosecution's case for it being fake?