Unfortunately the app had to take a hiatus this year! I'll be back next year. (Go Huskies.)
Each of the possible matchups in the bracket was simulated 250 times, based on each player's 2022 stats. When you request a bracket, the app will choose from 1 of the 250 simulations for each game based on the level of spice you specify.
If you'd like a deeper look at what's going on, feel free to check out this series of blog posts I wrote on the model last year. The biggest change made based on last year's results was a slight de-weighting of the Kenpom data (Kenpom loved the B10 last year, and so did this model...but the conference famously underperformed).