These claims don't contradict each other. At any point in time, there is no way Google stored any significant amount of records in memory. The scientist is no

These claims don't contradict each other. At any point in time, there is no way Google stored any significant amount of records in memory. The scientist is not saying it's impossible to multiply the matrix, he is just pointing out that you need to use special algorithms that don't require the entire matrix to be loaded into memory at once.