I suppose this reference has been going on for some time—no doubt I just noticed it because I’ve been caught up in reading Robert Caro’s splendid Johnson biography, The Passage of Power, and because of the NBA playoffs are going on.
For me—perhaps because of the Caro book, perhaps because I’ve lived in Texas for 30-(very)-odd years, or maybe just because I’m old—LBJ will always mean Lyndon Johnson. It doesn’t even mean Lady Bird Johnson, Linda Bird Johnson, Luci Baines Johnson, or Little Beagle Johnson. For sure, it doesn't mean LeBron James.
Though I’m also aware that you can’t fight popular culture. And also the photo below is funny.