The more I think about that article the more it reads as someone protecting Woodward at Moyes' expense.
I can't believe anyone (with "no budget" limits) would turn down Thiago at 20m, and I don't believe Moyes did. I do think Thiago was looking for reassurance that he was going to be a key player - whether soothing words from the new manager face to face (or Skype to Skype) or in the form of another "use me or sell me cheap" release clause in the contract, or maybe both.
It may well be that Moyes felt strongly enough about the principle there that he wouldn't do it just to appease the player despite the risk being low (so you have to sell a benchwarmer cheap, so what). Maybe he didn't know him well enough to make promises and didn't want to start his time as a United manager by lying about it.
So there you go, positive spin, same story revamped to make Moyes sound like a man of integrity than a ditherer.