Sorry you lost me on a few fronts.

1) you reference another article stating, "The method SSIS Data Pump represents the most effective way to load large amount of data into a SQL Server database because the SSIS Data Pump makes optimal usage of the transaction logs, parallelism, locking, and pipelining. A more detailed explanation is in the referenced article.". Yet I see no such detailed explanation in the referenced article.

2) you call xp_cmdshell to execute your package. This won't be usable on systems that dis-allow usage of xp_cmdshell.

3) your xp_cmdshell calls are executing a bunch of commands you can do in SSIS with the FileSystem task, or at worst the Script Task.