I think that is correct - i.e., only an additional HIV test (707) would be needed. For medical of 189, I don’t think it would be updated on its own. What you can do is that, once the new medical is cleared, you can take its screenshot from your immiaccount, and create a document with this screenshot and explanation that you took this new medical for 482 and also extended it to be valid for 189 (i.e., you can enlist all tests you took). Then upload this document to your 189 application attachment - i.e., in other document’s category. This will give the required information to the CO. I Hope this helps.
…
The document can look something like this:
Below mentioned (HAP: 1234567) health examination was completed as a part of my 482 visa application on May 5, 2021. By consulting the medical team, as a part of this medical, I undertook all the tests that are needed for both 482 and 189 visa applications. Following examinations were done as a part aforementioned HAP ID:
1.501 Medical Examination
2.502 Chest X-ray Examination
3.707 HIV Test
The screenshot of ‘immiaccount’ shows that the ‘Health Clearance Provided’. I hope that can meet the medical requirements for my 189 visa application as well whose medical got expired on DATE xx-xx-xx. Alternatively, if the co requires, I would be happy to take a new medical clearance as well.
{Attach a screenshot of the new medical here}
…
upload this pdf file (maybe write as a formal letter with the date) to the attachments of the 189 application as well (maybe you wish to incorporate this through ‘change of circumstances’ form- not sure if it’s possible or not).
My 2 cents.
PS: this is my view only, you may wish to consult with others (or any registered agent) before proceeding head.