> If the Atlantic currents do collapse, Europe will likely be covered by a glacier.

I think you misread the article here. Looking at Figure 15 (temperature change caused by a total AMOC collapse), it appears that Britain, Iceland, Scandinavia etc. would cool by around 2°C, whereas the rest of Europe warms by roughly the same amount. The consequences of such a strong temperature gradient are worryingly hard to predict, but don’t involve Europe being ‘covered by a glacier’. (Scandinavia, maybe? But not most of Europe.)