Took a little bit cause I didn't know how to use the tags to help with this search, but I found the blog post with the dl link for the voice test for Card Quest 2. It was surprisingly a lot older than I thought, with the post originating from August. Man time flies.
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Though with all the looking through their old blog posts, I couldn't find anything relating to the english version of CQ2. I must have either imagined it, saw it somewhere else, or got it confused with the latest patch for Echidna Wars DX where it added in some english commentary for the BGM in the files. At least I found the voice test. Nice to know I'm only going half insane.