I lost him when he said this:

And RAM goes a lot deeper too. Look at these two sticks of RAM. See how the one on the right has twice the number of memory modules? That allows the individual stick of RAM to pump through data more quickly than the one on the left, even though both of them are rated at DDR 3200 and CL22.

The bus width is defined by the DIMM standard. A 64-bit DIMM (which is what he is showing) always has a 64-bit data interface, regardless of what devices are on the DIMM. The DIMM with fewer devices on it just has 16-bit-wide microchips on it. That doesn't have anything to do with the latency or clock speed of the chips themselves.

And it's strange that he calls each microchip a "module". I would call that a microchip or a device. A "module" is an assembly that contains multiple microchips.

I just get the vibe that he's someone skilled at putting systems together but doesn't have any real engineering background.