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Is this new? As in, when was this policy developed?

From https://web.archive.org/web/20230101000000*/https://slack.co... it looks like they changed this sometime between 01-Apr-2023 and 18-Oct-2023

Then the date of 5th July 2023 looks likely as this is the date from which overall privacy policy is in effect: https://slack.com/intl/en-gb/trust/privacy/privacy-policy

Interesting choice of date btw