Read the article. MS have shipped 1.0-3.0 earlier...

"Azure Linux 4.0 is derived from Fedora, right now a Fedora 43 snapshot, rather than assembled package by package the way 1.0 through 3.0 were."

And if you are still unsure. Checkout the repo:

* <https://github.com/microsoft/azurelinux>

or more specifically, the releases

* <https://github.com/microsoft/azurelinux/releases>