I agree that the 70% figure appears to be BS but I don't think social commentary is the goal here. I believe the article is targeted at wealthy people and is trying to soft-sell scare them into spending more money on preventing future generations from wasting what they built.

Note how it urges them to employ a "Financial Planning Professional" near the end. Googling suggests this puzzlingly capitalized phrase is an umbrella marketing term for CFPs and other people with financial planning certifications.

Source: I work for a company that is constantly marketing to the wealthy and I know it when I see it.