If Satoshi had made such recommendations in his white paper or any of the post he made, I will believe it to be a wise decision but I don't consider it because I can securely buy Bitcoin from any safe source and hold it in a self custodian wallet which I am the only one that have access to the wallet private key. If I hold till any bull season where the price is much okey for me to sell, I will sell and hold the fiat till the price dip again, then I will buy more Bitcoin with the initial capital and the profit made.
A pretty solid approach, and one that many people often follow buy at a lower price, sell when it goes up, and repeat. However, it might not be a bad idea to also consider long term hodling without converting to fiat, since people often miss the biggest price jumps while trying to time the market just right. Satoshi may not have explicitly said this, but the whole idea of having full control over your own money definitely supports the self custody strategy youre using.