Looks like the cone has peg with it, so that's water soluble. I'm not sure about the Ethyl Ester of Pvm/ma Copolymer -- whatever that is??
I'm using something very similar but it's made by Beyond the zone but the ingredients are almost the same, the smell is the same and I haven't had any issues rinsing it out. I just wish it didn't have the drying alcohol as the first ingredient! But I don't use much of it and my hair hasn't shown any stress from it so I use it.
I guess all you can do is try it out and watch your hair closely. If it starts to get gunked up or dry.... you might need to use a detoxifier or sulfate like once a week to get it all out.
Natural hair color - dark brunette
Fine, thinish hair/3a, 3b