.. At the end of the day, the launch of this project kinda amplify the beliefs that PoS is not as secure as PoW, and the tradeoff between security and scalability is still debatable in many ways.
Yes, I agree with you on this point. Such ideas will not be very welcome in the Bitcoin community, the vast majority still believe that PoW is the best and most secure of all networks, despite the presence of some problems such as scalability and consuming more energy.
As for the POS, it reduces energy consumption and reduces fees and time somewhat, but its main drawback is security, as it is moving towards more centralization, and this is what the Bitcoin community does not like at all.
So if a POS chain has the ability to leverage POW/Bitcoin security, isn't that a huge advantage? Now PoS becomes more secure.