If you read TFA, you can see they did a lot of testing with "energy saving" bulbs. Low cost LED and CFL bulbs normally have a very low power factor (PF), often below 0.50. Bulbs from suppliers that can't be bothered to pass CE are even worse.
It costs the power company more to deliver power, if the PF of the load is low, so they charge you more - this is not new. Unfortunately, the general public has no clue about PF and just buys the cheapest junk they can find that says "energy saving" on the package.
Be smart, buy LED lighting with high PF. Those famous brand bulbs that cost 2x more are worth the price in most cases.