He can feel and comprehend and interpret emotions just fine, he is just deadly shy and insecure behind his stoic enforcer facade.
This is basically describing autism too. We can feel emotions just fine. But expressing them is hard because we do so in a way that can sometimes be upsetting to others. So we become shy and put up a facade that hides how we feel about things.
Also, “ASD-coded” is different than ASD. These characters don’t literally have ASD, but the fantastical sci-fi backgrounds the writers set up allow them to write the characters to behave and experience struggles in a way that is similar to someone with ASD. Especially problems fitting in with a group, socialising, and forming meaningful connections with others.
Santa isn’t omniscient. He sees you when you’re sleeping. He knows when you’re awake. We can infer from this phrasing that he can’t see you when you’re awake. He also knows if you’ve been bad or good but that information isn’t as specific.