Regarding that quote: We don't have a recording of the interview, just transcribed segments of it displaced from order and context. As journalists do.
"...to be faster than an F1 car around Silverstone..." With what? A road car? A track car? We don't know. A track car could have been planned from the beginning. If Palmer discussed a road car as part of the overarching partnership goals, perhaps some conclusions were assumed by journalists and forums lacking full knowledge of the project's scope.
What I'm getting at is that neither AM nor RBAT made claims of making a road car faster than an F1 car. And seemingly neither did Palmer, explicitly.
Palmer wanted a halo car to be faster than an F1 car of unknown era. A halo car often has editions and derivations. We just found out this year that they'll contest LeMans with a derivation of this car. How long has that been part of the plan?
A more accurate title for the thread would be "Palmer told journos he asked RB boffins for a quicker-than-F1 halo car." Ideally, a moderator might simply re-title it as "Aston Martin Valkyrie."
Given what the 919 Evo could do, the Valkyrie project may still deliver on its TT aspirations. Does the Valk need to match the 919's metrics in order to contest F1? Those being 849kg and 1160 hp for the 919 Evo. The Valkyrie road car is +81kg and -30hp. L:D ratio for the Valkyrie may be superior to the Evo given its clean sheet design which is free of FIA source dimensions.
They're not far off the 919 Evo specs and may surpass them in certain areas with the road car. I think this bodes well for the track version.