Yes. That op-amp is unused. If not configured properly, unused op-amps can generate noise and use excessive power. Read more.
It's good practice to do this in any circuit with an unused op-amp, but it's even more important in on-board preamps to avoid draining the battery, which is probably also why they specified TL062 instead of TL072.
Thanks, I didn't know it. I think I seen sometime the unused extra opamp stage, but developped more simply: with inverting input and output jumpered, and the non-inverting input directly to the vb.
At my first sight on the link you posted I think that's ok, too. Right?