Semi-Custom is indeed PS5 and Xbox. This increase was expected of course. It's lower margins than other segments though.
Epyc adoption is indeed slower than I would've liked. But so far it has matched or beat short and long term projections from AMD.
Enterprise is weird. AMD has better price and performance? Let's buy Intel. Meltdown lowers performance? Let's compensate by buying more Intel. Intel is supply constrained? Let's complain, and still buy Intel.
My guess is Intel is still pressuring OEMs to favor Intel. Cloud providers are increasing adoption though, and there have been a few nice HPC wins.
And lets not forget that AMD is selling every chip they can, TSMC production is fully booked.