What? The Chiefs have been swinging around +7 to +8.5. No serious book has had them anywhere near +10. There is no need to exaggerate with lines, +7/+8 are clear enough on their own in that it represents over a touchdown of disrespect.
This is the all time ultimate disrespect line, it is honestly fucking amazing. Previous largest line for a team over 5-0 was +5.5, and that team was "only" 6-0. Even trying to greatly broaden everything, just taking all teams 4-0 and up and lines 3.5+, only 3 games with disrespect lines this high exist - Buccaneers against Packers @ 5-0 after Packers won a Super Bowl in a season they went to the Super Bowl again (covered the line), Vikings against Packers @ 4-0 after back to back Super Bowl appearances for the Packers (Vikings won), and Bears @ 4-0 against the Bills somewhere in that 4 Super Bowls straight run (lost and failed to cover).
Those disrespect lines were barely justified, this one is just fucking staggering. While the situation might anecdotally bear out, that is to say the Broncos trash the Chiefs, I still do not think you can controvert the basic records - no 9-0 team deserves to be worse than +5 against any team, not even one putting on an offensive clinic nearly every week.