If anyone is looking for his gallery, my thesis is that since his beginning years of DeviantArt, he decided to delete most of his older works one-by-one once his artwork was present for a while. Most of his past works were funny, cute, and beautifully made, and some of whom should've stayed longer than expected. The idea of deleting past works has been finalized in mid-2019 as all of his artwork have been deleted. I'm guessing he stash his old galleries for privacy.
You can use the WayBack Machine in order to find his older works, but it works for a right URL and username.