He isn't against ISOs, the "there are no ISOs" is a Serenity-internal meme. The thing is that because SerenityOS moves so fast, it makes no sense to provide ISOs, they would be outdated within days. Also, Andreas and other top contributors have other things to worry about than keeping a nightly imaging system of some sort up and running. But if you (or me or anyone, even people inside the Serenity circle) were to make an ISO archive, nobody, including Andreas, would complain. It's just not a priority by any means.
Also, as mentioned previously, it's really not that hard to build it (even if you run Windows thanks to WSL 2). People are very willing to help you, and most of it is just waiting for the toolchain to compile (custom gcc and the likes).
