Urgot and the interaction with rune: Conqueror

Hello. I think Urgot has a bad interaction with the new rune: Conqueror. When you trigger with Purge(w), Rune activates itself but it doesnt deal true damage, but if you activate rune with auto attack and then use Purge(w) , it deals true damage. My question is: Is this how it should work on Urgot?
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