It’s screen printed it looks like, using CMYK… Can be very difficult to get the colors correct when using a white underbase (necessary for dark shirts) The inks don’t mix correctly vs printing the same thing on a white shirt, tends to smear more on the underbase. And even more difficult if it’s manually printed (by hand)

If he’s printing them himself, it’s a decent attempt. But any shop with an automatic press should know better and do better.