You're confusing deflation with deflationary currency.
It is ridiculous to assume that any artificially designed deflationary digital asset will produce long term returns greater than an index like SPY, which is intrinsically tied to human productivity in the economy.
An average, semi-rational investor will always have the incentive to lend to a credit worthy person/business/asset, regardless of how much artificial deflation you can induce in your asset.
You're literally creating a broken system by design. Don't complain when it doesn't work.