Switching lots of LEDs needs thorough decoupling. 0.1uF, 10uF and 220uF electrolytic perhaps. Does your MAX7219 circuithave good decoupling?
From the video it looks like you are taking the amplifier power from the LED breadboard - that's the main issue, the LED powerrails will be bouncing around all over the place and the ground wire between the power source and the LED board will beinjecting IR losses direct into the input of the amplifier.
I am thinking it is more likely a form of spam, have seen the same on a couple of other threads.