There are two reasons her name is officially known
This article describes one
https://ita.sport/news/beijing-2022-the-ita-informs-on-figure-skater-kamila-valieva/
"First, the ITA stresses that Ms. Kamila Valieva, a member of the Russian Olympic Committee (ROC) delegation in Beijing, is a minor and therefore a ‘Protected Person’ under the World Anti-Doping Code – this status applies to persons under the age of 16. As such, the parties are not subject to mandatory public disclosure of her name or any case she might be involved in, instead any public disclosure must be proportionate to the facts and circumstances of the case. Seeing that some in the media did not grant her the same protection and have reported widely on the basis of unofficial information following the postponement of the medal ceremony of the figure skating Team Event at the Olympic Winter Games Beijing 2022, the ITA acknowledges the necessity for official information due to heightened public interest."
Secondly - there has only been 1 minor who has competed already in the figure skating event so by even saying "a protected person" it is 100% obvious who it is