I do not believe it.Believe it or not, there are some half decent mutual funds. Look at the 15 year return for this one. Used to be the Sceptre Equity Growth Fund and had some fantastic returns around between 20 to 30 years ago with a different fund manager(Allan Jacobs) who then took off to Sprott and then left the industry shortly afterwards.
Yes, there are mutual funds that have beaten the market over a long period of time, but that is because there are so many mutual funds that some will beat the average by mere chance and past performance is not indicitive of future performance