I'm not actively maintaining this list at the moment and am unlikely to make changes unless there was some desire within the community to revamp the entire thing (for what it's worth I actually have other issues with the tier list we made back then - Top tier containing too many Pokemon being the main one).
I will just say that Vulpix's placement in Low was relatively uncontroversial back in the day and was heavily swayed by its initial suck period before it gets Flamethrower which Modulo covers reasonably well. It really doesn't seem like it can contribute a great deal before Flamethrower unless you decide to evolve it ASAP, in which case it misses out on its early Flamethrower niche. Once it gets there it is probably pretty solid even with the largish number of Water-types you encounter later on, so whether that's fair is of course subjective. To be honest I think I'd sooner use Growlithe and Charmander over Vulpix since I don't think the extra power of an early Flamethrower is nearly as much of a reward for grinding Vulpix to that point as some might think but I can understand why someone might prefer Vulpix (not that you can really "choose" between Growlithe and Vulpix in RB).
I will just say that Vulpix's placement in Low was relatively uncontroversial back in the day and was heavily swayed by its initial suck period before it gets Flamethrower which Modulo covers reasonably well. It really doesn't seem like it can contribute a great deal before Flamethrower unless you decide to evolve it ASAP, in which case it misses out on its early Flamethrower niche. Once it gets there it is probably pretty solid even with the largish number of Water-types you encounter later on, so whether that's fair is of course subjective. To be honest I think I'd sooner use Growlithe and Charmander over Vulpix since I don't think the extra power of an early Flamethrower is nearly as much of a reward for grinding Vulpix to that point as some might think but I can understand why someone might prefer Vulpix (not that you can really "choose" between Growlithe and Vulpix in RB).