Let's be fair to Morningstar (for once) - they maintained their nerve and called ATM a BUY when the market took a tumble in early June because of the announcement by China of moves to shore up its own domestic IF producers.
https://www.morningstar.com/stocks/XNZE/ATM/quote
So are they right this time to downgrade?
Well, ATM has run ahead of their valuation so they are calling it as they see it.