To the best of my knowledge the change you're referring to is only affecting to the Investigation priority score alert in Defender for Cloud Apps. You can still use MDA UEBA as before and investigation score remains in the product after the change.
MS Learn states the following:
We're gradually retiring the Investigation priority score increase alert from Microsoft Defender for Cloud Apps by August 2024. The investigation priority score and the procedure described in this article are not affected by this change.
If you want to leverage the investigation priority score alerts in the future I suggest you to use the hunting query mentioned on the article (instead of policy template) and adjust that one based on your needs.