Yes, reading the bill the idea is that after 20 years the SBR could sell up to 10% per year.

However I think that is a naive take....I think by the time we reach that point, the SBR would better be used a collateral for fiat loans. Or possibly better, is US Treasury issues "redemption certificates" using SBR as backing. We could wind up with a situation where US Treasury starts issuing its own money again, backed by SBR. (This is probably unlikely, but theoretically possible).

As an aside, Texas currently has a state Gold Depository bank. The idea is you deposit gold into Texas State controlled vaults and they issue you a "redemption certificate" for you to come redeem the physical gold at a later time. Clearly the idea was constructed with the idea that Texas State could become a "currency issuer" of sorts if people were to trade the certificates.....

A similar thing could happen via US Treasury / SBR.