Usually, not reliably. Once flicker banding is recorded, there often isn’t a clean universal post-processing fix; severe cases may require manual retouching.

A few limited workarounds were suggested:

• If you shot a burst, bands may appear in different positions from frame to frame. You can try aligning and blending frames in software to reduce them.
• If the lighting and exposure are identical, a flat-frame style correction may help: photograph an evenly lit uniform surface under the same light and use that as an illumination correction reference. This is tricky and only works in controlled conditions.

Best practice is prevention in-camera:

• Use a shutter speed that covers a full flicker cycle or synchronizes well with local mains-powered lighting.
• Take test shots and adjust shutter speed as needed.
• If you need arbitrary shutter speeds, use lighting with continuous output.
• Some cameras also offer anti-flicker timing features that help under sports/indoor lighting.

So: minor improvement may be possible, but there is no dependable general post fix; avoiding the problem at capture is the real solution.