Although I only had some rudimentary Spanish classes and am certainly not fluent, when I was in hospital recovering from a traumatic brain injury I was told (I don’t remember much about the month I was in ICU) that I would occasionally speak Spanish to the nurses, and that my Spanish was correct and understandable. This likely comes from storage in the procedural part of implicit memory, which is accessed separately from explicit memory.
All that said I would be very skeptical of stories of people speaking languages that have never been exposed to. Language has to be stored somewhere in memory to be accessed, whether that access is performed consciously or not.
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