Yes, Tezos does secure the network with proof of stake, but it also has a layer of security provided by real miners. This layer of security is provided by the miners who use their computing power to solve complicated mathematical puzzles in order to validate transactions on the Tezos blockchain. This layer of security helps to ensure that the network is secure and that the transactions are valid. Additionally, the miners are rewarded with Tezos tokens for their efforts, thus providing an incentive for miners to continue to provide their computing power to the network.
