It’s baked into the FAA data because it is still an accurate representation of the physical radial alignment. “Old” data does not equate to “obsolete”.
For instance, almost every VOR in the US state of New Mexico was last calibrated to magnetic north in the year 1965, and their calibration has never been changed since then. This includes, ABQ, SAF, GUP, OTO, CNX and ONM. One of the few exceptions in New Mexico is the Deming (DNM) VOR, which did not exist in 1965, and is calibrated based on 1975 variation.
This does not mean that the physical VORs themselves are still using the same radio transmitters and antennas that were present in 1965, I would assume that each has probably been upgraded several times in the 55 years since 1965. But even if a brand new VOR transmitter were installed today at ABQ, in the process of setting up the calibration of the zero degree radial, it would be precisely set to 13 degrees clockwise of true north, just as it was in 1965, in order to preserve the alignment of existing airways that link to surrounding VORs, which are also based on 1965 magnetic variation. The actual magnetic North Pole in 2020 at ABQ is 8.3 degrees clockwise from true north.