Here's why:
* Advanced Ritual Art's effect: It allows you to Ritual Summon a Ritual Monster by sending the required number of monsters from your hand or field to the Graveyard.
* Ritual Monster summoning restrictions: Each Ritual Monster card has its own specific requirements for summoning. Some may require specific Ritual Spells, specific types of monsters, or other conditions.
* Advanced Ritual Art's limitation: While it provides a way to summon a Ritual Monster, it does not override the specific summoning restrictions of the individual Ritual Monster cards.
Therefore, you can only summon a Ritual Monster with Advanced Ritual Art if that specific Ritual Monster's text mentions Advanced Ritual Art as a possible summoning method.
For example, you can't use Advanced Ritual Art to summon "Black Luster Soldier - Envoy of the Beginning" because its summoning requirements are specific to "Black Luster Soldier - Ritual" spell card. However, you could use it to summon "Chaos Sorcerer" because its text allows you to Ritual Summon it using any Ritual Spell.