Well, he means just the day Black Friday, and he’s likely not wrong. PS4 likely struggled to sell well on Cyber Monday because every single PS4 SKU has sold out before that.
There were PS4s available in-store at Target in Springfield VA on Monday. I didn't look on Target.com though. The catch is that all of the bundles were gone, as far as I could see.
There were a ton of Switch units in store (though no bundles, it seemed), and some XB1X units. There was one single XB1S remaining at that point, bundled with NBA 2k.