Yes, I believe all of that is in line with what I have stated. Just to clarify, my interpretation of the previous comment was that political parties were exempt from the requirement to provide an opt out in Australia for political parties (by my interpretation, just the official parties and not unrelated political organizations), and they implied they believed it to be the case in many other countries. I have not recently reviewed the relevant laws, so I was not 100% certain if that implication would prove true in the United States (though was pretty confident that was not the case by my previous experiences with messages from officially endorsed organizations), but I went on to explain how these are not officially endorsed by political parties anyway, so if such an exemption did exist, it should not apply to this particular message.
Thank you for the clarification!
Interesting to note, though another user pointed out that this does not work the same way in the United States (political organizations still have to provide a means to opt out).