That’s not to say that we should assume God flung him into a fiery pit of Hell second only to the cage (which may not hold Michael and Adam much longer); we just can’t take it for granted that God did right by Kevin.
Kevin really can’t catch a break, can he?
The Season 14 finale reveal that God is far from the benevolent figure he’d seemed means that pretty much everything he ever told the Winchesters should be taken with a grain of salt, and that includes what happened to Kevin.