It's not just attention grabbing. So far, almost all rust development I've seen has been in drivers. Getting something as core as scheduler replaced is a very interesting event.
I remember replacing the Linux scheduler in an undergraduate class. It's probably changed since those days but I don't think it's that hard. Doing a good job is probably very hard though.
I don't mean that it's particularly hard, but rather that it's using new interfaces which haven't been exposed yet, AFAIK. Scheduler itself + bpf is there from what I've seen, but likely other things too.