Uh, no. The article points out the metronomes are on a suspended table. Each metronome adds energy to the table in phase with its cycle, as more metronomes get into phase, their summed energy edition begins to push back on other metronomes bringing them all into alignment. By the end of the video you can see the table is oscillating exactly out of phase with the metronomes as expected by that point.
What difference does that make? The metronomes and table are a closed system, so the fact that energy is transferred between them is moot.
I think lutusp's explanation makes a lot more sense: that when the metronomes sync up, they're at a lower energy level. They spend energy to decrease entropy.
