Most/all plastic for food use is BPA free at this point. Looks like elaborate marketing. I think something like 95%+ of metal food containers are lined with plastic to prevent the metal from reacting/leeching into the food. Making some assumptions here but I suspect because the vast majority/all of the aluminum can supply chain is plastic lined that these are as well.

BPA free doesn't mean all plastic though. So we'll have to wait for a YouTuber to helpfully try it out in video to show whether or not they do. But also, this doesn't have to be a purity test - even though I think they probably use plastic inside of their cans because they very studiously avoid saying they don't, less plastic is still less plastic. A very thin layer of liner vs enough plastic to be durable as a bottle is an improvement over the status quo.