
He is right in everything here, except that an 30% sales as download sounds far to low to me.
Could be as high as 50%, one thing limiting it would be fans who wanted the box.
I also think Skyrim has sold well on pc the months after release to. Some people was slow, other probably migrated from consoles because of mods and performance.
Some things changed from Oblivion, then Oblivion was released it required an good gaming pc, Skyrim runs on anything with an dedicated graphic card like an 800$ laptop.
Many who played Oblivion on consoles wanted Skyrim with mods.
Far less piracy than Oblivion: multiple reasons, first can not use the workshop with an illegal version, neither skse as I understand, it is needed for more advanced mods, less need to download an pirate as an "demo" to see if they could run the game, you can get if without going to an store.