Any statement that refers Buffet as a trader is a oxymoronic statement. His holding period is probably higher than most of the "buy and hold" investors.
IMHO many are confusing day trading with investors. The only way to enter a position is to trade (cash for investment instrument. stocks, derivatives, commodities, forex etc). It's still a trade but not "day trade" unless they close position before the end of day. He trades stocks and derivatives, that's the way to enter and exit a position. His holding period is longer than "day trader" . He is not a "day trader". Not sure anyone said Buffet is day trader, only the few who do not understand the difference.
To say that Buffett only trades stocks is not correct. I am quoting from here: "https://www.armstrongeconomics.com/writings/2012-2/banking-manipulations-a-systemic-problem/" "Buffett’s fascination with this crowd did not fade away. The second venture with PhiBro came in 1997. This time, they rolled out the old 1970s commodity trick of moving inventory. They began shipping silver from New York to London and it was there that Buffett would buy silver neatly hidden behind the international cloak. Inventory in New York plummeted and they fed this news to the perpetual metal bulls to set them up for the kill as always. After silver prices doubled from September 1997 into February 1998, the CFTC was forced to announce that it was looking into the accusations of market manipulations. The CFTC called the Bank of England who ordered all silver brokers to show up the next morning. This forced Warren Buffet to come out and announce that night on February 3 disclosing he purchased about $1 billion in silver shocking the financial world that had assumed Buffet only traded stocks. The Oracle of Omaha disclosed that he had taken a major shine to the metal and bought up 129.7 million oz. of the stuff or about 37% of the world’s aboveground stock of raw silver, according to the CPM group, a commodities and precious-metals consulting firm."