It isn't that Magnus doesn't process what he's told; he does. But it's all so bizarre and nonsensical that he has to run it back through more than once in an attempt to parse it properly.

This is a mistake on his part, as he goes into a loop trying to understand the idea that he's been pulled away from one Cybertron to another. Or that there was even a multiple universe theory.

Something audibly pops and his optics go dark. Then he simply topples over.