I just realized, this is an M3, so it is showing the download page for mac/arm, but all of the download links (even for linux and windows, mac intel and mac m1) do this.
Tried that and getting same result. I was able to download from another laptop and copy it over, but definitely willing to try more things just let me know. I dont want to waste your time if it is an issue on my side! Thanks!!
Well I did change the DNS settings for *.joplinusercontent.com, but not for objects.joplinusercontent.com which has a separate IP. So normally the objects sub-domain should still work fine but since you mention this issue I wonder if it can affect something somewhere.
The IP reported by curl is correct, it should be 13.38.218.148 but I don't understand why it can't connect to it. In my case I tried with curl, firefox and Chrome without any issue.