You can write MIDI in FL too. Unless you don't like the editor then just stick with sibelius. However, the difference between your song and the other is, that instead of playing all the strings at the same time chords are arpeggiated. Like in case of C major, which consists of notes c, e, g the chord is played one note at the time. Like this: c-e-g-e-c-e-g-e...
On the other hand, maybe you should make a thread in 'Sharing Is Magic' and ask if there are any guitarists willing to volunteer for a collab. After all, fake guitar is always fake.
