Pretty poor advice imo, it's comparing a risky versus a risk-free return. Paying off a 7% interest nets you that return, guaranteed. Investing in a 7% stock market nets you that return on average, but it could be -30% that year, too. Volatility and risk requires compensation for it to simply be accepted. Where the threshold lies is hard to say, but I think it's much more sensible for example to pay off a 5% interest in lieu of investing in a volatile asset class that does 7% on average.
> If you have the space, buy products you're guaranteed to use in bulk on sale
That's true but, space comes at a cost, too. A square metre in a city costs about $6000. I'm not interested in buying 'years of supply of toilet paper' on sale and getting into the business of storage at the most premium price (residential real estate) level. Not a bad suggestion but shouldn't be in the top 50 I think, let alone as point nr 2.
Alright the rest is kinda of mediocre, not really worth going into. There's so much much better personal finance advice out there, even one-pagers out there, that this isn't really worth discussing.