The article mentioned Merchants of Doubt. I recommend following it up with Industrial Strength Denial https://www.amazon.com/Industrial-Strength-Denial-Corporatio..., which documents similar practices supporting industries like leaded gas, radium (promoted for health including injecting it and using it in suppositories), and slavery.

As an alternative to Oatly, I bought a soy milk making machine (used from Craig's List for $15). Like a rice cooker, it's not necessary but it does the job easily. It can work with rice, oats, cashews, etc. I make new soy milk every few days. Ingredients: soy beans and water.

The article doesn't mention the packaging, another similarity with Coke, but food packaging creates a lot of waste. Buying soy beans in bulk in reusable bags reduces a lot of that pollution.

Another great alternative to Oatly is water -- for hundreds of thousands of years the only beverage humans drank after weaning.