The risk of me (or anybody) forgetting the method used to secure the seed is exactly the same as the risk of forgetting where you hid the seed phrase to begin with.
No, the risk is much higher. If you, your family, or your relatives find a piece of paper or metal with 12/24 words on it, they will have everything that's required to recover the coins. Assuming you didn't use a passphrase or a multisig setup. On the other hand, if they find a string like the one you shared in your OP, they might have no idea how to proceed with decoding it. And you might forget it with age as well.
The idea is to use a method you're very familiar with
You are familiar with the method, are your heirs?
so the chances of me forgetting it are... well... nil.
You slip, fall, and hit your head on cement while clearing snow from your yard. You end up in a coma or worse. What do the chances for recovery look like now? A drunk driver hits you with his car on your way home from the general store, etc.
"What if you forget or die, and your family can't access the funds?" Well, that could be easily solved by making your family memorize the securing method from the beginning, wouldn't it?
Meanwhile, what happens if a thief gets ahold of your unprotected seed words, and drains your funds? Then your family won't be able to access said funds regardless.
OK, fair question. But how are you going to explain to a thief what the encoded string is if he finds it in a safe or tucked away somewhere neatly in your home? Are you going to tell him it's a poem? You keep a poem on a piece of paper in a safe or in your wall? A couple of broken fingers or threats to your family might motivate you to tell him what it really is. If you want your family to depend on their memory, why not make them remember a passphrase only. Write down and hide the recovery phrase normally. Put a little bit of money on it. Store the rest behind a passphrase and have your family memorize that passphrase. If an intruder finds the seed, and understands what it is, he can't know you have more coins stored behind a passphrase. He will just steal the seed and you and your family will live.