It's really hard to comprehend that video. The cost of de-icing fluid is meaningless in the context of all those peoples lives.
There is no way to know what lies under that snow. No way to know if it has melted and frozen overnight, or if one wing will clear or the other will not. Or if an Airbus will take off with snow and a CRJ can't. You are a test pilot with that much contamination. Airbus does not test the aircraft to that limit.
All those previously lost lives, rules written in the blood from previous fatalities. I guess it doesn't translate into Russian or perhaps they just know better?