TL;DR: Active Funds cost money in fees, but can be set up to produce more dividends, so they might be preferred for retirees.
Longer version below.
Active vs Index
Mutual Funds can be broadly categorized as Actively Managed Funds or Indexed Funds.
In an Actively Managed Fund, a human being is making decisions about which stocks to purchase and sell, whereas an in Index Fund some kind of algorithm is used (eg, maintain a portfolio that is representative of the S&P 500.)
Perhaps counterintuitively, the performance of Active and Index Funds, on average, is very similar. But Active Funds have higher fees, because they need to pay the person doing the trading. This means that for many cases, it makes better sense to use an Index Fund, where the performance is basically the same, but the fees are lower.
Spend Money to Generate Income
I think what the quote is trying to say is that when you approach retirement, it may make sense to "spend money" in the form of the higher fees for an Actively Managed Fund, because you can control the dividends. To get an income stream for retirement, you either need to sell some of your shares, or have dividends. Retirees generally try to avoid selling shares, since they are a finite resource (you'd need more money to buy new shares, but can only get more money in your retirement from selling shares or dividends!)
As an example, Tesla hasn't ever generated a dividend, but is a valuable company and is in the S&P 500. Therefore, an Index Fund that naively matches the S&P 500 won't be producing any dividends from the "Tesla" portion of its investment.
So you might pay more in fees to have a Managed Fund that with the goal of "matching the S&P 500, but with a bias towards dividend producing stocks."
This Fund would have similar performance to the Index Fund, but produce more dividends for your to use on expenses.