I found those docs, And it clearly states for Skype for Business Online. I understand what you mean. I was just cleaning up and it seems strange to leave entries that reference Lync and Skype when those haven't been used for more than a year in our case. Even this doc has similarly obscure details
https://docs.microsoft.com/en-us/microsoft-365/admin/get-help-with-domains/create-dns-records-at-any...
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