Wrong. I have spent nearly my entire career flying in either this arctic or the one down under. Do not mess with visible moisture in the winter.
I agree the icing effect is extreme and needs adjustment but you should NEVER fly a 172 into ANY cloud in -2c. EVER!
In real life you are putting yourself in grave danger.
ALL clouds contain enough moisture to create extreme icing at those temperatures. Anything above about 75% humidity at -2 will cause icing.
Flying in close proximity WILL ice up a 172 in those temps. Just don’t do it.