Ah - there may be a slight misunderstanding here.
Since the stOSMO pool would serve as the price oracle, the pool would need to be sufficiently deep to deter attempts to manipulate the price through aggressive buying or selling.
In order to prevent manipulation, Stride contributors deployed the Redemption Rate Contract, which Mars is using to strengthen its stATOM and stOSMO oracles.
But ultimately, the best thing to deter manipulation is to have deep liquidity in the pool, which is the intention of this proposal.