It only applies to deliveries directly from Amazon and drop shipping sellers, but Amazon is essentially a marketplace and the original sellers don't have to co-mingle.
You're completely safe from co-mingleing if you're actually buying through Amazon from the original manufacturer and the article information says something like "sold and delivered by TheOriginalManufacturer"
> "sold and delivered by TheOriginalManufacturer"
It's commingled if it says "sold by TheOriginalManufacturer, delivered by Amazon"
It's a pretty small line next to the price.
(Prime delivery tag isn't an indicator btw, sellers can get prime certified and still handle their own shipping.)