Return of incandescent light bulbs as MIT makes them more efficient than LEDs

Somewhat misleading headline by the Telegraph. This is a proof of concept and doesn't really hint at any "return" of incandescent light bulbs unless they reach their efficiency hopes and get them back on the market. Maybe a return in relevance at least?

Technically they have not made them more efficient than LEDs yet. Their proof-of-concept reached 6.6% which is still about half of the efficiency of LED bulbs.

These new incandescent bulbs can theoretically reach 40% efficiency, but that has not yet been done.