That cable is fine, it is shielded.

Graham, I make all of my own cables, all are shielded and very heavy duty. I used to purchase Hosa and Monster cables, both of which are relatively high quality, but not great. I found that I got much better results by constructing my own cables of much heavier gauge wire and soldering all my connections. Most commercial cables are crimped connections, which eventually fail due to corrosion or mere break at the crimp.

Good luck,

Gary