I think you're looking at outdated documentation. It talks about Oracle 7.3 and Oracle8.

Oracle is now at version 11.

The documentation is also about the deprecated Microsoft OLE DB provider for Oracle, which is not available in 64-bit.

It's recommended to use the Oracle OLE DB provider instead.

edit: there are some datatypes in the list marked as "not supported", while I'm sure I have already imported them with SSIS, so the list is definately outdated.