It is a little buttery. You can taste it right at the back end when you swallow. For me diacetyl puts a frown on my face and this time it did.
I will say that other aspects of beer can put a look on your face like the slight pucker or gentle kiss of a lambic or sour beer or the chewy motion when you first taste a big roasty stout. It’s kind of slick and that slickness stays at the back of your throat after you swallow.
The malt taste is trying but not as crisp as it would have been. It’s a good toasty beer though. Hop bitterness becomes more forward after a few sips. The other thing that diacetyl will do in a beer is take away from malt scent on the nose and flavor. This one does. And accents hop bitterness. This one did. Another gesture that tells you diacetyl is the hand up at the waist, palm forward. No more .