No it's not a lie. I've paid capitol gains tax about a dozen times in my life. Anyone that sells a house and made money, will pay capitol gains tax. Same with stocks. (the break point is roughly $47K, but anything over that will be taxed).
Here's how it's determined if you're subject to capitol gains:
"Any time you sell an investment for more than you bought it, you potentially create a taxable capital gain. Capital gains can apply to almost any investment that is sold at a profit, such as stocks, bonds, real estate, precious metals, options contracts, or even cryptocurrency."
So... if you've ever sold something like that and did not pay capitol gains, sounds like you're ripe for an audit.