Enabling SMTP Basic Authentication on Office365-Tenant after 1.Oct 2022

I understand that SMTP Basic Authentication on Office365-Tenants will be automatically disabled from the 1st October 2022 on. As SMPT Oauth 2.0 Client Credential Flowhttps://docs.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth#smtp-protocol-exchange by Microsoft we can't move our product implementation (non-interactive) away from Basic Authentication.

We therefore need our customers to be able to keep SMTP Basic Authentication enabled after the 1st. October.

Question:

• Will existing Office365-Tenants be able to keep SMTP with Basic Authentication enabled until Oauth Client Credential Flow will be available for SMTP?
• Is the same also true for new Tenants that are created in future? 

Thanks!