It’s the synth block for sure, blended with his 7-string. Guitar plays the low octave, Synth block plays a saw wave with the next octave and slightly detuned for some seperation, then another saw wave in an even higher octave slightly detuned for some seperation. The 3rd synth is playing white noise to give it some fullness. Then the enhancer block if you want the Album's double-tracked sterio effect, and some reverb which is standard on this type of synth.
You can learn a lot of cool tricks by looking up some "How to make EDM" videos on YouTube. The Synth block is amazing, especially when you mix it with modifiers attached to the controler envilopes.
Here is a preset I threw together for the FM9. Scene 1 is an ideal studio version totally of my own making, and Scene 2 is a possible live version based on the gift-of-tone live preset: