If you had to delete any part of the quest, then you don't need to do the 4 statues, as that's where you get the very start of it and you are already on the next step. After this, you need to light the 6 plates in the Anchor of Light. I suggest you read a guide so you know what to do. https://www.eurogamer.net/articles/2019-10-29-destiny-2-xenophage-quest-6007#:~:text=Destiny%202's%20Xenophage%20is%20an,Read

Opening the chest after lighting the statues is only needed to initially get the quest. Since you already have the quest, your next step is to be completed somewhere else on the moon.