I think its easy to pick apart the specific numbers but it is also a good way to think about how you want to spend your time vs how you do by default. And that will let you make decisions about optimizations and time/money trade offs. For example you can just eat Soylent and not cook at all (not a good tradeoff in my opinion) or automate bill paying and bill management. Living in a place without lawn care requirements vs living with some amount of garden.
It also points out why married people (and people in committed relationships) have "more" free time as many of these jobs can be done for 2 people in the domicile in the same time as 1 person. So you can split them up and complete them in parallel, freeing up time.