The VF Record doesn't seem to compare as favorably to other tires tested with butyl tubes (e.g., in BRR data, 9.0w for VFR vs. 10.0w for tubed GP5000, and 8.3w for TL GP5000). Are you implying that there's that there's a substantial difference in latex vs. butyl advantage for the VFR? IIRC, there has been some historical precedent in performance variance between different product runs of tires before.

Edit: I re-read the BRR review and it notes: "We also tested the Record with a 78 grams Vittoria Latex tube, and rolling resistance came in at 7.3 watts at 120 psi / 8.3 bars. 7.3 watts isn't enough to beat the tubeless Corsa Speed G+ 2.0 or Michelin Power Time Trial with a latex tube (both 7.0 watts). A 25 mm wide version of the Record would probably be on par with those tires when fitted with a latex tube."

Edit 2: From comments by RR author (JarnoBierman) [references are to the original French test on the VFR being fast]: "Thanks for your link. This issue has now been cleared up a bit for me! 100% sure they changed the tread of the Record somewhere last year.
Look at my pictures and then your pictures... You have the version with the very smooth tread (almost like a latex tread). When you look at my pictures you'll see it has a textured tread just like all the new Veloflex tires released in Q3 2020."

From the looks of it, BRR's tire's track looks similar to what louisn posted in Feb. 2021 (although his were tubular); would you be able to confirm whether the VFRs you tested with were the smooth or textured tread?