If true, it looks like previous announcment was part of some kind of bargaining strategy with RR and the Brits. Not uncommon in these types of deals.
TF-X is imprortant for UK as well, esspecially considering BREXIT aftermath on its economy and industry. Germans and French excluded the Brits from their new project, Desault took the place of BAE. So, TF-X represens oportunity for british defense and avio industry to keep and fruther devolop its technology, keep pace with others, by being parner to Turkey. Who knows, if UK-Turkey relations keep imrpoving at the pace they have in recent 2 č-3 years, maybe TF-X becames joint UK-Turkish venture.