I added that comment on the Wiki, but I didn't test with the latest revision (the one with arguments, but AC3 doesn't use arguments).
I'll add a link to the wiki.
Splatoon preview version, last working build with AC3.
SSB fix version, this one breaks Assassin Creed 3 compatibility.
Note that it's an old v0.2 version, it doesn't work with Homebrew Launcher, and changelog on the first post should be in chronological order up to splatoon support if you wonder what's done in this build.
you will have to use your own local server to host the exploit. it's the browser method only, no SD launcher.
Maybe a dev could check what changed in the SSB fix and broke AC3. (between Feb 14th and 19th).
compiling each commit could help to find the first with that issue.
When you launch the game, nothing happen, no log on the server. Maybe an issue with RPL size ? 30MB