I recommend reading all the essays by Anne Helen Petersen on substack about Alabama and the Greek system. My daughter was in a sorority at UA from 2018 - 2020 ( yes she dropped out) and confirms these essays are accurate.
Here is a link to part 5, with links to the other essays in the series
The more old row frats will be everything you fear, plus hazing. The newer frats which are seen as less cool, may be different. Those old row frats are likely to not even be interested in him as he isn’t already known to them from high school/ church/ home town.
The Greek system at Alabama is largely conservative (incl preserving traditions as well as politically), and hetero normative. And conforming. Not everyone in the Greek system is like this, my daughter and her friends were certainly not, and there are houses with reps for being more progressive. But the overall vibe is like that.
However if he is interested he can go through rush when he arrives on campus and visit chapters he thinks sound good for him. He doesn’t have to accept a bid. First semester is pledging and he will be busy with pledge duties. Blount will also put on programs and they area close knit group. He may decide he doesn’t need a frat. He can still do tailgates and go to football without a frat.
It’s also worth remembering that 70% of students are not in the Greek system, and that a lot who start freshman year in a house, drop out over time. Greeks dominate SGA but as my D says: they are so obsessed with not changing anything, that nothing ever happens so little point being involved - if your aim is to be involved and make a difference there are lots of other ways to do that!