My regs got CE in a lab in Italy, and it cost the equivalent of a new small car. In fact you wont see my first stages with CE on them yet because the lab didn't get done until after I had made my first production run, going forward they are marked CE (current production run). My second finished CE while they were still in production and the CE was laser etched on them prior to shipping to me.The alternate use of "CE" as a mark meaning an item is for export from China was a popular web myth that went around a few years ago, and you can still find reference to it as a discredited rumor/myth with a quick Google search, but the"CE" mark is protected by trademark (i.e., you can't legally make a mark that is cofusingly similar) in many jurisdictions.
The far bigger risk is that some manufacturers will self-certify products they know to be inadequate, or will certify products that are adequate but then omit certain elements needed for certification in cheaper versions of the product that are then fraudulently sold with the "CE" mark. And a high percentage of these products do come from China, where respect for intellectual property, safety, and other such rules has significant room for growth. Buy a cheap aftermarket iPhone charger and your odds of experiencing this firsthand are fairly high.
Some (not many actually) stuff for diving is self certify and simple, others, not so much.