Please understand all the products on AliExpress are posted by seller members. For your concern, I suggest you contact the seller to confirm it. Or even better, you can ask the seller to offer document which proves his/her products are original or qualify.
At the same times, AliExpress is also paying attention to the products on site. If the product you received is not what you agreed upon, you can open a dispute to request a refund before Buyer Protection time run out.