It makes sense. Saving money is cool but is where the magic happens. You can have both. Putting your cash in things like stocks, real estate or even Bitcoin can make your money grow way better than it would in a regular savings account. Sure Bitcoin can be a bit wild but it's part of the game. Diversifying your investments around is like playing it smart. It helps you ride out the ups and downs
The advice you say also makes sense because the benefits are clear between saving money in a regular account and using it to invest in shares, real estate, or even Bitcoin. Because until now Bitcoin is still experiencing significant price growth in the market so the benefits are also becoming clearer, so the advice you say is also quite good and cooler than just saving money in an ordinary bank account where there will be no additional money at all.
Investing to other assets is always a better choice, that is, if you will also dedicate yourself in educating yourself how to handle them when you encounter different scenarios. Always think of contingencies because if something goes wrong to one asset, at least you have something to fall back onto.
Using money in several investment assets could also be an additional option that is as good as what @Natsuu said. Because he also said about several investment options such as shares, real estate, or even Bitcoin which can always be relied upon even though there are risks too. But so far we can all see that profits and wins always lie with people who believe in stocks, real estate, or even Bitcoin. So those who save money only in bank accounts will not be able to feel the benefits of investing in shares, real estate, or even Bitcoin.