It's a tiny, infinitesimal chance: but it's a heck of a lot greater of a chance than the same thing happening with a bank account, especially the "no recourse" part.
There are 2^256 wallets. There are 2^72 grains of sand on earth.
The chance of your bank screwing up is a lot higher, by trillions.
I'm a huge critic of the cult of crypto, but the odds of a key collision are smaller than the odds of <some highly improbable series of mistakes/coincidences/malice happening that result in you losing your money in the traditional banking system>.
The odds of a 'someone gets access to your account/wallet and instantly drains it with no recourse' are much higher in the crypto space, as the author of the post experienced.