Also, when the topic of Bluetooth comes up, many people complain that they have Bluetooth issues. Sadly, some manufacturers do not care about interoperability. Maybe I'm just lucky but I don't even recall when I would've had issues with Bluetooth. I use several devices practically every day (car, headphones, speakers).
The whole premise of the article is that this allows for efficient use of WiFi hardware to emulate BLE like behaviour.
Table 1.
Wi-Le Energy/packet: 84 uJ
Wi-Le Idle current: 2.5 uA
BLE Energy/packet: 71 uJ
BLE Idle current: 1.1 uA
So, like I wrote, Bluetooth consumes less battery.
In addition there are unsolved issues, which are likely to add to the overall consumption.
Edit: formatting
Line from right above the table so it could possibly go the other direction and use less.