That was a tweet a few weeks before he actually put it up for auction. I think it was after the London promo show where he cursed one of those guitar's inability to stay in tune and blamed the current administration for even spoiling his enjoyment of playing it.
In the end it's a good thing he's doing. As ever I find his version of logic screwy and mostly entertaining. I remember thinking if the monsters also put him off his other Buck too, thinking he only had one more of these guitars.