It is a different technology entirely. CDC is just the log of changes on a relational table. Delta Lake appears to be providing more native administrative capabilities to a data lake implementation (schemas, transactions, cataloging).

CDC you are looking at the change logs of a Relational Database typically.

With a (batch) Data Lake you accept as input different file types (JSON, CSV, AVRO) from various systems. Could be Hadoop systems, could be from a COBOL system on a mainframe.

The Delta here isn’t so related to CDC. This is a replacement for the ad how methods people use now to keep multiple readers and writers of datasets in parquet format in agreement when using Spark’s dataframe API.