To change the email address of the group, follow the best answer here: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_exchon-mso_o365b/how-to-add-an-email-alias-to-an-o365-group/79d94383-442a-4e3a-ac62-4ff1ea8af962.
We’re working on renaming the Team Site. Stay tuned.
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The link you shared doesn't go anywhere. It leads to blank search results. Can you update the link please?