These vaults use Tetu's single asset Tetu Farm vaults to generate yield, but continuously compound all claimable rewards from the Reward Boosting System into the underlying asset. This strategy requires little maintenance from the user at the cost of the early withdraw penalty and lack of TETU rewards.
With the cost of less yield, you gain the convenience of having all rewards directed into the underlying deposited asset, requiring no maintenance of the position other than depositing and withdrawing, which also provides a more composable solution for future integrations.