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Power BI can access Snowflake external tables through an ODBC Connector. This means that Power BI can query an external table for data that resides in Dell ECS to create insights against data processed in Snowflake using virtual warehouses.
The access pattern that Snowflake supports today traverses the AWS network backbone and exits to the public internet to reach the on-premises Dell ECS. This means that the ECS S3 endpoint must be publicly accessible.
Snowflake, Faction, and Dell ECS use Transport Security Protocol (TLS) 1.2 for data in-transit. All data traffic is encrypted using TLS, thus preventing vulnerable access points from cyber-attacks.