This may be so-so either way, but probably Seth is right.
The biggest problem is usually re-creating the footprints. It doesn’t make much sense to try to create a KiCad layout from gerbers if you don’t have footprints with which to replace lone pad graphics (and silkscreen lines, texts etc.).
In this design you can delete the one big outer polygon, cutout polygons and polygons which represent those “negative” openings. After that you have the pads and the tracks left (now, after exporting, they are covered by larger polygons). After replacing pads with real footprints – which you have to design separately although it’s possible to copy some items from the board to footprint designs – you have the tracks connecting the footprints, but there aren’t so many tracks here, and you could have just drawn them from scratch.
For the footprints it may be easier to find ready made replacements for example from the KiCad libraries.
Then you just need one zone covering the board. As far as I can see, the largest polygon is the ground zone outline. In the gerbers the holes in the zone seem to be made with negative shapes and then tracks and pads again with positive shapes. That’s a different strategy than what KiCad uses.
So, if you want a design you can edit further, you have to do so much manually and there’s so little you can save from the original that it may be easier to do it from scratch, following only the dimensions from the original.
Here’s some instructions for reverse engineering from gerbers, but it depends on how the gerbers are constructed: