The first two sentences in what you quoted are quite misleading in that they imply that your nondeductible contributions to your traditional IRAs can somehow be kept separate from the other money in your traditional IRAs. That's not possible since your basis in nondeductible traditional IRA contributions applies to your traditional IRAs in aggregate, not in any particular account. By referring to a "nondeductible IRA," the article repeatedly makes the invalid assertion that the nondeductible contributions are isolated in a particular IRA. There is no such thing as a "nondeductible IRA."
