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A recent development not mentioned in this article is Wi-Fi Halow/802.11ah, this is a new standard using the 900MHz ISM band. Advantages of this are better signal penetration/range for the same output power (or lower output power for the same range).

Compared to 2.4/5G wifi Halow uses narrower bandwidths so has lower data rates but is still much higher than BLE. BLE can do up to ~2MBit with a 2MHz BW, 802.11ah can do up to ~8MBit with a 2MHz BW but can go up to 16MHz BW. Additionally 802.11ah supports MIMO, so it can also scale the bandwidth up with more antennas.

There are some other new fun features in 802.11ah namely TWT (target wake time) which is a powersaving method that solves a lot of the problems the article mentioned with powersaving in wifi.