Clicking drives can also sometimes be recovered wirh this method.

I think the clicking in that specific case comes from the fact that the drive sends the arm / heads to the parking position immediately when the rpm of the platter doesn't match expectations, because rpm is critical for keeping the distance between head an platter.

Meaning the heads are ok, but clicking because a seized up bearing or motor doesn't spin properly.

Be aware though, it is theoretically possible that ice crystals can form from air humidity condensating, which can cause the head to crash into the platter which makes the data definitely unrecoverable.

It's also just ridiculous that this statement, even if true, would satisfy anyone.

Even if the numbers were "the best ever", it's clearly not good enough to get us out of this climate crisis. So at best he's saying he's unable to do enough