Well, it was discussed in the past, but we don't consider fan speculations based on ears as a solid source. I think those hentai seiyuu database make a conclusion a bit too easily (e.g. if more than two fan sites agree, they take it as a source). I don't necessarily say they are wrong, since it might sound too obvious to hentai game fans and already become "known facts" among them, but more public sites such as wikipedia never accept those speculations made there, so I'd say it doesn't belong to VGMdb either.
It's totally fine to use a note field to mention there is some rumors on who is whose alias though.
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