We don't need "story problems".They explained in without that and even got into some details including head of household vs married filling. No, it didn't have math story problem examples, but when you give snippet of what the law is and give the accompanying numbers you don't need to, especially as it explains various benefits of filing married or even head of household over filing single.
Just some analysis using tax forms & basic arithmetic.
Lacking that, the claims are unevidenced.