Not according to Kenpom. They have Michigan with the toughest strength of schedule. Another site has you all tied with Mich St.Kansas 2020 played the toughest schedule in the country and won the best league. SOS points above avg team: +11.63 (1st of 353 teams)
Won its last 16 too when Covid hit. But yeah that season never happened, nah
Also, the best league was the big 10. 10 of their teams were in Kenpom’s top 30. Big 12 only had 3 or 4.
The regular season happened, but you don’t get a championship for that, bud.
By all means, hang a banner that says we tied for toughest schedule in 1 metric if that makes you happy.