Questions about WBTC/digg LP setts

From what historical period are the estimated ROIs for Setts derived? I’m struggling to understand how the WBTC/Digg LP Uni and Sushi Setts can yield the stated ROI when the LP fees for the pair on both Uni and Sushiswap are quite low these days.

Also, what is the schedule for the DIGG and BADGER liquidity rewards for these sets?