I have not actually read the article yet. I'm just asking about these paragraphs that seem to be a little jumbled.
First, SSIS will never store or save decrypted password fields. If your connection requires a password, and you check the Save My Password (or Save Password, depending on the version of SSIS you’re running) checkbox, and your SSIS package is encrypted.
SSIS will store your password internally and encrypted if you use Windows Authentication, the Connection Manager will connect to the database in the context of the user who executes the package.
I think that you really meant to say:
First, SSIS will never store or save decrypted password fields. If your connection requires a password, and you check the Save My Password (or Save Password, depending on the version of SSIS you’re running) checkbox, and your SSIS package is encrypted, then SSIS will store your password internally and encrypted. If you use Windows Authentication, the Connection Manager will connect to the database in the context of the user who executes the package.