@"wizoatk"#p240424 026061800 has the workaround
You're right in this point, my bad. The workaround which was announced and delayed this release was about the ability for sideloading from this Android 17 release to future releases, not from previous releases to this one. And that's included, right.
So this paragraph of my previous post:
harp I can't speak for GOS, but it seems to be a bit more difficult to provide a workaround, so they decided to publish this release anyway, without that workaround, not letting people wait any longer, who don't necessarily need updating via ADB-sideloading.
is not accurate.
And so related to that:
xxx Sorry I thought there's already a workaround integrated.
https://grapheneos.social/@GrapheneOS/116771724030142359
the workaround is included as announced in that linked Mastodon-post:
Our workaround will provide working sideloading from our initial Android 17 release to a future release. However, it isn't currently possible to sideload from 16 QPR2.
Edit: The cited post above by @wizoatk was deleted(?)