Is the potential danger of snow suit wearing child in a car seat debated?

https://www.cbc.ca/news/canada/manitoba/manitoba-child-snowsuit-dangerous-car-crash-1.4445407
“What could happen is when you have a child in a bulky winter jacket or snowsuit, the straps on their jacket may appear tight when they’re in it [the seat], but in a crash, the forces are so extreme that if that snowsuit or jacket compresses, you now have that amount of extra slack in the harness. And the harness’s job is to keep your child in the seat.”