Ironic that your link to the ASUS site is (working) HTTPS.
I checked the liveupdate01.asus.com and dlcdnet.asus.com domains referenced in the article, and they can certainly serve over HTTPS...
I checked the liveupdate01.asus.com and dlcdnet.asus.com domains referenced in the article, and they can certainly serve over HTTPS...
So outbound to an insecure HTTP url gets rewritten to pull from a HTTPS url instead etc.