There is no "obvious bias". Firouzja is an "Iranian teen".
The fact that "a teen" has beaten the undisputed world champion and number one chess player in the world for the last 10 years at anything involving chess is very surprising and called out in the title (also a lot more click-baity).
Believe me, if and when Firouzja achieves Magnus status and if he then gets beaten by a teen unknown to general audiences we will see a similar headline with Iranian replaced by the teen's country of origin and "Magnus Carlsen" replaced with "Alireza Firouzja".