Yamaha CP-1 - Sympho effect?

Something strange I stumbled across whilst Googling.

In their 2010 review of the Yamaha CP-1 stage piano,  Sound On Sound listed the onboard effects. One of them was described thus:

"Sympho (a multi‑stage chorus from an unspecified Yamaha string machine)"

 My underlining.

Unspecified? There is only one Yamaha Strings Machine, the SS-30.  I wonder where the reviewer got this info from?

There is no strings synth emulation among the presets on the CP-1. Yamaha must have just decided to include this chorus because it sounds so great.

Digging deepr into the CP-1 manual I found this

• Chorus - The Chorus effect applies a standard chorus.
• D Chorus - D Chorus produces a chorus effect that is more natural sounding, softer, and wider.
• 816Cho(816Chorus) - The 816Chorus effect reproduces the thick, detuned chorus of the TX816 — famous for combining eight DX7s in a single rack unit.
• Sympho (Symphonic) -Symphonic uses multi-stage modulation to produce a wider-sounding chorus.

Obvioulsy it's stereo as wider means between left and right speakers. So, it can't be exactly the same as the SS-30. Hmm...