Japanese and Spanish happen to have very similar pronounciation. It's a neat detail in the Animal Crossing games that seems to have gotten mostly lost in translation for the English version.

In Animal Crossing, the characters' audible speech seems like it's speaking the first syllable or two of each word in the text dialog and sped up, and the pitch control varies between characters, so while it generates amusing gibberish, some of it is lightly comprehensible and interesting and OP's link is a pretty good replica of it.