Post second sundering (i.e., in the time of 5th edition), many dead or lost gods were indeed restored to life and existence; Myrkul is included in this, though he is reduced in power from the position he once held, and is now subservient to Kelemvor, at least somewhat. As far as I can see, most of their lore in relation to gods is technically accurate, though it often comes across as placed in by people less than familiar with it.
The only real issue I took with any of the gods and deities as described was that they seem to be making the dichotomy between Shar and Selune into some very great dramatic epic war thing, which it really isn't...
And also, oddly enough, Maglubiyet... Post second sundering, Maglubiyet is in fact a "Greater Deity"; he's a potent being. More than that, however, is the fact that the one goblin we meet who talks about him talks in terms of following and worship, and that's not really accurate: Goblins don't "Worship" Maglubiyet in the manner that most others understand worship. They pay fealty to him, as do most goblinoids, but goblins in particular fear him. They *don't* want to die in battle and war, because they believe that if they do, their souls will be enslaved by Maglubyiet and forced to fight for all eternity in the endless wars of Acheron... a fate which most goblins do not, in fact, want.
Those goblins that remain followers of Maglubiyet when the Absolute tries to take over would not be doing so out of faithfulness or loyalty - they would be doing so out of fear more than anything else. Hobgloblins, on the other hand, do worship him and pay honest fealty to him with fervor, becuase death in battle, with honour, and an afterlife of warfare, IS something that a hobgoblin might generally aspire to.
