Yes this, just read the data from the website. And based on the data that I read from the website, this project will implement both Proof of work and Proof of stake at the same time.
(I could make this conclusion because of this statement).
We hope to achieve a full transition to PoS mining and validation much faster than it happens in the Ethereum network
but why do I feel like, something is missing? still watching for more information, still have plenty of time before the date of the snapshot/hardfork.
That is, they intend to do this earlier than such decisions will be implemented by the developers of Ethereum?