He went to the Fertitta's and demanded more money... they said no and called his bluff. He tweeted he was ''retiring'', so the UFC moved to replace him as the main event for UFC 200 because they still had a show to put on.
It wasn't until after being removed from the event the issue of ''press obligations'' came up. It was a smoke screen so Conor didn't come off as being greedy and overbearing, and tried to deflect the negative press and lay the blame on the UFC's shoulders rather than admit his own fault in the matter.
Beyond all that, if you're going to be a pro fighter and headline a card while being well-paid for it, press duties should be expected and owed to the promoter. It was never an issue when he was winning, only after he lost. I don't buy the ''press obligations'' excuse what so ever. He pushed, the UFC pushed back harder, and Conor was put in his place.
It wasn't until after being replaced that Conor lobbied hard to get back onto the card. Ironically, you said it yourself, he tried to ''force'' his way back onto the card. Lesnar was a proven draw, so they used that as leverage to get Conor back in check and under control.