I am not an experienced floor person or anything, but that looks like regular hardwood flooring to me, i thought subfloor was usually cheap garbage wood that looks terrible, I doubt they would have put work into making a nose on a floor that was meant to be covered up. Looks old too.

Maybe it isn't just Max, but it's anyone in town who has the knowledge about the person they're trying to mimic. So in other houses it could be different people paralyzed getting their memories sucked out.