You apparently didn’t actually read the news. It’s stickied at the top, but I’ll link it for you (since you seem to lack capabilities).
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Iris, the new pet reward for Season 8, will now be available after completing Chapter VI as opposed to Chapter VII.
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We believe these changes will make progression and earning Iris more accessible to players jumping into the new season. We will have more news once we have additional information on the client update to address the in-game tooltips to represent this change.
I even bolded it for you.