[lukev]

Assuming you aren't actually pushing them in far enough to press against your eardrums, you're fine.

The physical feeling you get is just pressure on your outer ear canal - it might be uncomfortable (though it shouldn't be, try a different size plug) but it won't lead to hearing loss.

The kind of hearing loss that article is talking about is only caused by exposure to loud noise, and you're only going to be better off wearing earplugs for that.