@Kesshi Jordan​ :

1. Based on the closed issue on the dbt-spark GitHub and the comment from a year ago in the #db-databricks-and-spark channel of the DBT Slack community, it seems that the enhancement to the async thread that does delta catalog updates has not yet been deployed. Therefore, the recommended fix of setting spark.databricks.delta.catalog.update.enabled=false is still relevant.
2. The implementation that you have shared seems to be correct. Although the Terraform documentation separates sql_config_params and data_access_config as optional maps, it seems that they can be nested within each other. In your implementation, you have correctly set spark.databricks.delta.catalog.update.enabled to false within data_access_config. Therefore, if this parameter is not taking effect for you, it is possible that there might be some other configuration issue causing the problem.