There's only three ways that a smart person can go broke…liquor, ladies, and leverage.
The quote from Munger is not actually advice though. He doesn't advise to not use leverage, he merely warns of the danger of using it.
Can you quote him saying that is not investment advice?
Because everything Buffet & Munger say is treated as investment advice - they're the most famous investors in the world. The fact they warn about one thing and do another should be noted, and not ignored.
Another example: "Never bet against America" (2020 Q2). Buffet's known for buying stocks and having a long holding period. Yet around the time of that quote, Buffet was dumping his 9% ownership in United Airlines, among other stocks. Someone who is dumping stocks and preferring cash is betting against American stocks. To me, "never bet against America" rings hollow based on what Buffet did at the time. But even if you want to be more charitable to the investor legend, you would have to say his words do not reflect his actions in the stock market. So if you want useful information about Buffet, you need to follow his stock purchases (which the market does... OXY jumped when Warren's new purchases were revealed, and there's other examples).
So for Buffet, I don't pretend to be better at leverage than him, but I also don't trust him to accurately portray his company's leverage - that's not part of his folksy image. I would also say 1.6x leverage calls into question if he beat the markets, considering he has been measured against a 1.0x leverage S&P 500. In any event, look at his actions not his words if you want the highest quality information about what he's actually doing.