Let's assume you have a mom that loves you very much and she let's your know by text on a semi-regular basis. She asks you to come by on Friday. That might seem like a nice idea to you. You reply yes, and you go.

Now, imagine you got messages from what appears to be not 100 but, oh I don't know, 1 000 000 000 000 000 of the very best moms that have ever existed.

And they all do love you so very much. And they do let you by writing these most beautifully touching text messages. And they all want to meet up on Friday.

What is going to happen next? Here is what is not going to happen: You are not going to consider meeting any of them Friday, any week. You will, after the shortest of whiles, shut down to this signal. Because it's not actually a signal anymore. The noise floor has gone up and the most beautifully crafted, most personalized text messages of all time are just noise now.

Yes you do. You're being over-literal.

"Noise" in context doesn't mean random characters, it means garbage or spam or content not worth your while.

He is talking about semantic noise. Something that appears to have substance but is just slop actually. When everything is that. Then all email will become equivalent to slop. How could it not? Someone will be burned once or twice, but after that, there is a semantic phase shift.