Said it once and I'll say it again: ever since Patreon shut him down a couple of years ago, during the making of Savior I think, animating stopped being his main source of income (I'm not sure if it ever was though, but prior to this he was more active).
Sum hasn't dropped in quality (I think) but his pacing does not justify active support IMO. If anyone wants to support him, best thing to do is subscribe once when a project comes out, and then cancel the next month. I don't blame the man, at no point did he ever promise continuous releases and neither Patreon nor SubStar enforce them.