There were some small reasons such as being busy making gameplay footage. He wants to do a Metal Gear Solid V review and has heard other requests such as that of Dark Souls 3 and Bloodborne, but doesn’t want it to be halfhearted and/or disappoint fans.
However, his main reason for being incommunicado was that he was avoiding Persona 5 spoilers. He’s not blaming Atlus for the slow localization. He recently in his Downwell review posted a link to why and on his patreon stated that he will write but not read tweets.