Yeah, ok, so this appears to be the original discussion of the Coffeelock. It wasn't on ENWorld.
http://www.giantitp.com/forums/showthread.php?542159-Hexblade-Coffeelock
http://www.giantitp.com/forums/showthread.php?542316-Let-s-break-Xanathar-s!
IMO, this is all quite 'silly'.* I don't have any patience for designers who put out this sort of stuff, and then put out tweets that imply** that it was intended. I don't have any patience for players who would try to bring this into a game. And I don't even know what to think of a DM who assails his players with it. For whomever finds it fun, great, go for it; to me, it seems like a severe waste of time.
* Would prefer a stronger term, but, you know, it is a matter of taste.
** Yeah, there are lots of possible combinations of having not thought about it, not caring, thinking it's cool, or not having the balls to admit it's a screw up. I really don't care which. I don't respect any of them.
The DM right now did not abuse Coffeelock.
He only used Metamagic, wings, Sniper Spell, Earth Bind, Repelling Eldrich Blast, Magic Missale, Enemies Abound. And access to cleric spells (Divine Soul).
In fact, it could have abused more of the Enemies abound ...