If that link is about Wall's AAU coach, it's a non-issue, but of course, since it's UK, it will be blown out of proportion. Brian Clifton, Wall's AAU coach, paid for some expenses on road trips with Wall, which is completely normal and common practice for school and AAU coaches to do, buy McDonald's on the way, or whatever. However, because Clifton not only was a coach, but had been previously registered as an agent through FIBA, though he hadn't practiced in a few years, that's what makes this shaky and why it's being brought up. The NCAA and SEC have been reviewing it for a few weeks now; at worst, Wall misses three games because of the technicality. Not a major infraction, but I'm sure that won't be the way it's played.
EDIT: Saw the link, not a couple UK recruits, just about Wall, the second recruit in that article is Mississippi State's Renardo Sidney.