I got ahead of myself. Buried Fossil exists, but back then there was only one card for Kabuto and pals to evolve from. I'm questioning why you would be able to play the Restored Kabuto on this when there is no evolutionary path for it to get into play.
As I'd understand it;
- From the Japanese perspective, you're correct, e-Card Kabuto/Omanyte/Aerodactyl could only evolve from Buried Fossil at time of printing. However, they were Stage 1 cards which stated they evolved from Mysterious Fossil, and once Mysterious Fossil did get printed in the ADV (and PCG) blocks all Kabuto/Omanyte/Aerodactyl had this either/or option.
I would read it as contradictory to how Buried Fossil was handled if a ruling was issued that Old Dome Fossil
can't evolve into any card that is named Kabuto. However, even though the Japanese "unlimited format" technically should go as far back to e-Card 1, Japanese rulings aren't
necessarily beholden to early sets, and the cut-off currently seems to be BW1 – they formally still support DP1-on on the site, but it doesn't feel like they actually do still do that. In other words, they could rule otherwise and it wouldn't actually be a "contradiction" to Buried Fossil, because they don't think that far back anymore.
I do think another card you'd want to look at and consider is Eevee GX and its Ascension DNA Ability, as that's another card with a mechanism that allows it to "evolve into" Stage 1 cards, though it's not quite the same scenario.
- From the international perspective, the idea of an English unlimited format is a mess, but the argument would be that e-Card Kabuto/Omanyte/Aerodactyl were always in a scenario where they could evolve from Buried Fossil
or Mysterious Fossil, which happened again with the EX era, and I think the only reason the question of whether Buried Fossil can evolve into any of the Gen 4 Kabuto/etc. is that it was rotated out anyways, and unlimited rulings are a patchwork mess that only come up when people ask about it.
In other words, for both editions of the game, the precedent exists that when Pokémon cards can evolve
into another Pokémon card, it can override the matter of what the card it is evolving into says it's evolving from – so Old Dome Fossil
should be able to evolve into a BW Kabuto. However, none of the precedents seem binding in this scenario – even though I think Eevee GX should factor into the considerations here, at least somewhat – so the matter could be handled either way.