I didn't mean to say their numbers were correct but between their number and nothing, they are all I know as a source. Even though I don't take them as truth, as I have been advised before not to, it could at least be used as a reference, I think.
Maybe NPD numbers should be more reliable but I have no idea where to see them.
As for Rorona in west outselling Japan, regardless if VgChartz is accurate or not, I don't think it's that hard to believe. Think about it, there has been not many JRPGs since FFXIII, Yakuza 3 or Resonance of Fate since the beginning of 2010 on HD Consoles and if JRPG fans want to try something different there is Rorona right there with no competition.
Also, considering that it didn't sell that much in either region, I say it is at least plausible.