No, it's still safer than writing down your seed words in plain text, there's no debating this, otherwise this puzzle would already be solved.
It is way less secure than using a strong cipher with the same secret data.
Your mechanism leaks bits of the plaintext, which is always bad.
You could have just used your 4 dates or whatever shit you are using and use a
proper encryption cipher.
Then no single bits would have been leaked and you'd be pretty fine.
With this however, you are wasting yours and our time.
Do whatever you want.. when storing 20$, no one will care. You could also just store it in plaintext.
The obscurity is still there
And security by obscurity is proven to be bad.