Hi, thanks for posting.
NCrunch currently does not support the DataSourceAttribute this extension is derived from. Because NCrunch's support for MSTest is emulated rather than integrated, the only way to make this attribute work would be to painstakingly re-implement all its functionality (and quirks) from the ground up ... which is a huge task. Because so few people make use of this attribute and MS seems to be moving away from it, the decision was made not to implement it.
You're welcome to
vote for DataSourceAttribute to be supported if you like.