It's true that e.g. medications and alcohol can increase the risks for the child, but many people also have apnoea (often without knowing) which can also lead to sudden movements in your sleep.

The article says there's no socio-economic factors; the data says the risk is the same for all babies.

If you don't want to change your habits because of an article, that is fine, but people should be aware of the risk.

We use a co-sleeping bed next to the parents bed and the infant is just as close, but safer from harm

Something being ‘instinctually normal’ does not make it inherently the safest option