I don’t think pointing out the fact that there has been a decrease in ETH staked from now since December is entirely significant. Lido launched in December, got a lot of hype (Eth2 Phase 0 as well), hence why many people staked then compared to now.
This proposal helps to improve the peg between stETH and ETH, and will soon be taken into effect. Future integrations with other protocols (eg. Aave, Maker) will also benefit the peg aswell.