Kukreja in “Data Engineering with Apache Spark, Delta Lake, and Lakehouse” says that a Kappa architecture has no data lake. Microsoft in https://learn.microsoft.com/en-us/azure/architecture/data-guide/big-data (see picture) mentions a “long term store” without saying what it actually is. It uses that data to “re-compute”. For me this is a data lake.
Does a Kappa Architecture use a data lake or not?