Is it a vast overstatement though? From Arizona's perspective, only beating Stanford will give them a boost in the eyes of the committee, and it's early but outside of those 2, no other team is a safe bet to make the tournament at this point. Oregon/Oregon State aren't tournament teams if they keep on this same trajectory, UCLA is far from a tournament guarantee, Colorado is undefeated but hasn't played any projected tournament teams yet, and other programs like Washington State and Utah are currently on the outside of the bubble.
If you look at every other P5 conference, they all have at least 4 teams that look like locks to make the tournament, while Pac 12 has 2:
PAC: Stanford, Arizona
SEC: South Carolina, Tennessee, Georgia, LSU, Ole Miss
ACC: Georgia Tech, Louisville, NC State, Duke, North Carolina, Notre Dame
Big Ten: Michigan, Maryland, Indiana, Ohio State,
Big 12: Texas, Baylor, Iowa State, Oklahoma, debatably Kansas State
At this point it looks like the clear weak conference of the 5.