Honestly, it doesn't even need a lot of learning. He gave up by the letter "D". From "D" on, the symbols he made up are just mostly stylized versions of the letter it's meant to represent. He mirrors letters, turns letters sideways or adds an extra stroke or two and that's it. D being "db", K is just backwards, P being mirrored Ps as well, H being diagonal with one more line through it, W just has a dumb spiral, XYZ are just long and drawn twice. Seriously, take another look at it, it's impressive how dumb it is.
He couldn't even be creative with creating a fucking cipher.
He's probably retarded enough that despite the vast majority of the letters being extremely visually similar to what they represent that he actually can't memorize it either.
He ripped off the heartagram for his brand/image so I guess it isn't surprising he'd rip off the entire fucking latin alphabet too.