Article is wrong
If anyone from the register cared to look up the regulations you can make the CE marking hollow:
18.104.22.168. Principles of affixing the CE marking
"The CE marking can take different forms (e.g. colour, solid/hollow) as long as it remains visible, legible and respects its proportions. It must also be indelible so that it cannot be removed under normal circumstances without leaving noticeable traces (for example some product standards provide for a rub test with water and petroleum spirits).
Nevertheless, this does not mean that the CE marking must form an integral part of the product. "