If the sulfate free shampoo contains Cocamidopropyl Betaine or Cocobetaine it will remove all silicones. See here: What's the Scoop on Silicones?

Pomtango, according to the link you supplied, your shampoo contains Cocamidopropyl Betaine, along with 3 other cleansing agents. Your conditioner link didn't have an ingredients list, so check your bottle for silicones (end in -cone, -conol, or -xane). If it's silicone free too, then unless you've used a silicone product since starting CG, your hair should be silicone free.
CG since 11/2011
2c /3a F /Mii, low porosity

Summer Products /Routine:
Clarifying: ACV rinses, Suave Professional Men Deep Clean Peppermint
Low Poo: Renpure Luxurious Argan Oil
Co-washes: VO5 Kiwi Lime Squeeze or Strawberries & Cream
RO: VO5 KLS or S&C, Cure Care
LI (if needed): VO5 S&C, VO5 SC, Cure Care
Stylers: FSG, AIF,
Tresemme Flawless Curls Bouncy Curls gel
PT: IAGirl's (link) as needed