the fact that so many people think that the tweet isn't racist because it doesn't use an explicit slur shows how smart and dangerous the kid is. If you read it without context, sure, it's not racist. But given that context exists, it's a clear signal both to alt-right folks across the country and to folks on campus that he's a racist and is gonna get away with it. I'm guessing many blacks and BLM supporters feel it's a threat, even if indirect, while the typical white Kansan is like "I don't see what the big deal is".
someone linked to his telegram page and I came across this (which he didn't actually type, it's kinda like a retweet), but it shows how he thinks:
combine that with his interview with the news where people were protesting his event and he's like "we just want small government, ma'am", the suits, etc., it's clear these folks are trying to brand their racist group as something that isn't a bunch of redneck confederate flag racists that everyone pictures in their head. He might be getting a little more bold than he should (getting TOO much attention) but he can push buttons, get attention, and probably most dangerously, get a following from KSU students whose parents are on KSO defending him.
https://youtu.be/s9opUXiZbA8?t=64