Good for you, but it would have been much simpler and faster with ImageMagick in a shell script. (imagemagick in your repo, + potrace if you haven't got it already)
And if you stick with Gimp, INTERPOLATION-NOHALO is a better option, the only thing "Cubic" has for itself is a low CPU usage, but on modern PCs you won't notice the difference.
Code:
convert input.svg -resize WIDTHxHEIGHT output.png
And if you stick with Gimp, INTERPOLATION-NOHALO is a better option, the only thing "Cubic" has for itself is a low CPU usage, but on modern PCs you won't notice the difference.