The list is offensive, there is something to the basic idea. I have some friends who come from quite wealthy backgrounds, and as we've got older, its been really interesting watching the subtle changes in how they approach certain things. So: two couples we're friends with for years and years, both now in very high earning jobs, one where both are from I guess you'd say upper middle class/old money backgrounds, without much of the money left (so not given huge handouts, but raised with a certain attitude) other couple both parents did well but first in families to go to uni and raised kids with a 'study hard and you'll do well' attitude but no talking about money.
Couple A: bought crumbling but do-up-able house in very established 'fancy' neighbourhood, have slowly been doing it up, it has massively appreciated in value since they bought it. Couple B: bought new build that was well insulated in 'newish' suburban neighbourhood that would be convenient for their work at the time, were in negative equity for a bit, traded up to a similar house when they were out of negative equity, have quite a bit more housing debt than couple A now but similar value houses.
Couple A: drive an ageing 15-year-old car, very focused on spending disposable income on investments, building some kind of share portfolio (they're not awful people who talk about this all the time, but we're v close to both of them so this came up at some point). Couple B: had a car loan for a new 4x4 which they probably needed more than couple A because their new build wasn't as well connected, had a kitchen loan to do up their kitchen, have pretty decent pensions at a guess but nothing beyond that and do enjoy their money on holidays etc etc.
Now, neither of these is necessarily the 'right' way to approach anything, but I think its interesting that both couples have probably similar household income, both have specialist jobs and are very hard working, but I would be surprised if by retirement couple A don't have significantly greater net worth.
I have family members who didn't think it was worth doing courses or taking entry level positions that involved internships/putting off earning for a few years in their early twenties, when actually they would have then been earning much more. It wasn't that they couldn't afford it, it was that they didn't grow up with the 'knowledge' that sacrificing income at the start can help you get into professions that will earn more in the long run.
I think PPs are right: if you're dealing with actual poverty none of this advise works, and if you want to address societal inequality then structural changes are needed. But I definitely think its true that for the small number of people who do manage to earn a lot more than their parents, there's this additional cultural barrier they face of things people don't talk about but learnt from their parents that enables them to solidify their wealth and earnings.