That Dude is way wrong about Missouri.
Big 12 champ receives automatic bid to the Fiesta bowl. Can’t be Texas. Could be Ok, but that assumes Ok Beats Missouri in the Big 12 Championship. But we don’t even know who the Big 12 South champ is yet.
A win By Missouri puts them in the top 10 easily.
Missouri is still in the hunt, but like you said, they will have to win out and win the the Big 12 championship against (probably) Oklahoma. That won’t be easy. If they don’t win the Big 12 championship, they won’t get in because Texas, Texas Tech, or Oklahoma will get the at-large bid (depending on who of that group wins the Big 12 title game).
I’ve seen Missouri projected for the Holiday Bowl elsewhere. The Tigers definitely still have a shot though.