Yes, like Curlypriya said, that product is CG safe. To elaborate, PEG or PPG in front of a silicone means it's been modified to be water soluble. That means it will cowash out and is safe to use on a strict CG, cowashing only regimen. You usually see the PEG or PPG followed by a number, like your PEG-12 Dimethicone.
CG since 11/2011
2c /3a F /Mii, low porosity

Winter Products /Routine:
Clarifying: Herbal Essences Tealightfully Clean
Low Poo: Renpure Luxurious Argan Oil
Co-washes: Suave Naturals Tropical Coconut or Daily Clarifying
RO:
Tresemme Expert Selection Perfectly (un)Done, Cure Care, Suave Tropical Coconut or Daily Clarifying
LI (if needed):
Tresemme Perfectly (un)Done, Renpure Brazilian Keratin Straightening (old formula), Cure Care
Stylers: HETT, AIF
PT: IAGirl's as needed