Context

In 3.10 when you use Storm Brand or Armageddon Brand, the damage counts as being YOU whenever it activates. If a monster has reflect, YOU take the damage. If the monster applies corrupting blood, you're going to receive that too.

In 3.11 there's a new Brand (Arcanist Brand) which states in its description that it TRIGGERS linked spells.

Even though the spell is being triggered with Arcanist Brand, does PoE still consider those spells originating from the Player?

Please refrain from becoming armchair-philosophers. I want sources if you have them.