There’s a whole thread on that article. The person who inspired/ provided the data for the article is a forum user. The data set is inherently flawed as it uses BLS averages to draw a conclusion. NYT reported that in 2023, Millenials households spent a mean of $7K annually on travel - and typically, the more they spent, the more sacrifices they made elsewhere.
Ultimately, most people who spend big on Disney spend little elsewhere. For example, the average family spends nearly $600 per child on back-to-school clothing. Obviously that number was a lot lower when I was growing up in the 1990s, but my mom bought all our clothing from Mervyn’s — cheap stuff too, like $1 shirts and $5 jeans — and returned it when we outgrew it (they had a generous return policy). Her annual spend was probably no more than $20. People mocked me for being poor lol… all to save up for WDW trips.