This opinion piece, and the "study" it is based on are suspect. For example, the opinion piece talks about Germany's "growing reliance" on coal, but everything I've seen points to Germany reducing its use of coal. For example, the Wikipedia article on the subject says:
"Germany's electrical grid is part of the Synchronous grid of Continental Europe. In 2018, Germany produced 540 TWh of electricity of which 40% was from renewable energy sources, 38% from coal, and 8% from natural gas.
While nuclear power production decreased only slightly from 2013 to 2014, electricity generated from brown coal, hard coal, and gas-fired power plants significantly decreased by 3%, 9.5%, and 13.8%, respectively. Germany will phase-out nuclear power by 2022. "
Reuter's had a similar article, noting coal use was decreasing. Maybe they are making the claim that night-time use of coal is increasing, but they certainly don't say that, and since wind-power tends to increase at night, I'm not sure I believe that either.
The assumption of a 10-year battery life is also a question. Both Priuses and Teslas have shown greater than 10 year useful life. Most, if not all, EV manufacturers now offer 8-year warranties, so they certainly expect there to be little degradation in 8 years. Just don't expect a long life if you live in AZ or NM and leave your car outside or in a hot garage.
The other thing about EVs, is there contribution to GHG emissions can change significantly even after they are on the road. I know of no other vehicle that has the potential to improve its emission characteristics drastically after it is already on the road. Certainly the hydrogen or methane powered vehicles this article is pushing are better for emissions than gas or diesel, but they won't get better with time.