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My understanding was that the LC-F with the TTV8 was indeed cancelled despite a showcase prototype being built. Yet the same TT V8 was then shifted over to be used as the starting basis for the powertrain (TT V8 + hybrid, possibly??) in the upcoming LFR/LFA2 which has been widely documented as various test mules and prototypes on tracks.
Either that or a different V8 block was used for the basis for the LFR/LFA2 powertrain which is definitely V8 twin turbo.