Bitcoin cannot change to PoS. It is impossible. Why don't you understand? Bitcoin is the collective of users. Is that concept too difficult for you? Your "official statement" is a strawman.
I do not represent bitcoin but am just one user of the protocol so cannot give an "official statement" and never suggested as much.
So you are suggesting that if a majority of the developers and community decides to do a hardfork from PoW to PoS this wouldn't be called "bitcoin" because you don't agree?