Microsoft
MicrosoftMagicHair You can absolutely add allows using Tenant Allow/Block List, as per the next sentence in the article you referenced:
"Instead you use the Submissions page at https://security.microsoft.com/reportsubmission to report the email, email attachment, or URL to Microsoft as Should not have been blocked (False positive)."
Once you use the Submissions page, select "Should not have been blocked (false positive), and "Allow emails with similar attributes" - that creates a temporary and safe allow entry that you will see reflected in the Tenant Allow/Block List right away.
The possible delay you're mentioning is expected if Microsoft needs a bit of time to review your submission before we adjust the verdicts, but even that is now handled automatically if we need more time, and the entry will be removed from the Tenant Allow/Block List once we've learned it's safe.