Google "wifi projection alarm clock" and one product shows up, with universally poor reviews that for the most part have trouble with the Wi-Fi not connecting, Wi-Fi stops working after 6 weeks, etc.
You have the world's largest database of consumer products at your fingertips, it's easy to verify his claims.
A lot of devices have a hard requirement for 2.4ghz and 802.11n and the need for awareness of this is not trivial.
I have been reduced to keeping track of each mac address on my network and it seems like all the IOT devices use the same group of generic Chinese chipsets.
You have the world's largest database of consumer products at your fingertips, it's easy to verify his claims.