This is a slightly tongue-in-cheek way of saying that if you believe a security is severely mispriced then there is a straightforward way to express that opinion.
This is a great argument why buying an index is a poor choice for a long term investor. You can avoid a great deal of shenanigans by randomly purchasing stocks and holding them for 50 years. Even a 0.02% annual fee costs you 1% of your long term returns over that timescale.
But there’s tradeoffs to everything.
This is not financial advise.