If you look at the help file for that function (SelectByID2), you'll see an append parameter, the 6th one. In your query it is set to false. If you set it to true you can append this selection to the list of selected items.
If you know all of the names of the items you want to select, this method is fine. A more robust way would be to use the persistent ID for each feature. That will never change, even if the feature names does.