This does not sound like a critical bug fix. It’s mainly an update to the camera’s lens distortion correction data, used to reduce barrel and pincushion distortion for supported Nikon lenses.

The effect can be visible, but it’s usually most noticeable with lenses that show stronger distortion, especially wide-angle lenses, or in subjects with obvious straight lines like brick walls or architecture. In many everyday photos, the difference may be hard to notice unless you compare before-and-after images side by side.

If you already correct distortion later in software such as Camera Raw or another editor, the update may matter less to your workflow. If you rely on in-camera correction or the camera’s retouch features, it may be more useful.

So: worth installing if you want the latest lens correction data, but it’s not generally something you’d consider an urgent fix.