It's late, so I could be making dumb mistakes here, but I think the numbers are at least loosely factoring in those sort of expenses. It's not 100 hours/week just to cover rent, it's 100 hours/week to actually maybe afford that rent.
$7.25/hour x 40 hours/week x 4 weeks/month = $1160/month gross income
Assuming a maximum of 1/3 of gross income goes to housing, that's $383/month available for rent. The site calculates $377/month as "affordable rent" for the minimum wage worker, so for the sake of the argument, I think my calculations are close enough.
So, that means for every hour worked, about $2.39 is going towards rent ($7.25x0.33).
$2.39/hour x 106 hours/week x 4 weeks/month = $1013, which is just over their "1-Bedroom Fair Market Rent" rate of $1002/month.