This is a known behavior/limitation with Amazon Redshift external schemas (Spectrum) + ODBC + Toad Data Point, especially with certain driver versions like 2.1.3.
WORKAROUND
External schemas and tables are visible in Toad Data Point when using ODBC driver version 1.5.20.1024
STATUS
Issue fixed in Toad Data Point 2026 R2.
The latest version of Toad Data Point can be downloaded here.