That was a very different case.

Out of the two claims, the only one that made it to appeals court was about whether it was fair use for Bleem to use screenshots of PS1 games to advertise its emulator (which was compatible with those games). The Ninth Circuit decided it was. But that's not relevant here.

The other claim was more relevant, as it was an unfair competition claim that apparently had something to do with Bleem's reimplementation of the PS1 BIOS. But the district court's record of the case doesn't seem to be available online, and the information I was able to find online was vague, so I don't know what exactly the facts or legal arguments were on that claim. Without an appeal it also doesn't set precedent.

If there were a lawsuit over OpenTTD, it would probably be for copyright infringement rather than unfair competition, and it would probably focus more on fair use and copyrightability. For fair use, it matters how much something is functional versus creative. The PS1 BIOS is relatively functional, but a game design and implementation are highly creative. On the other hand, despite being creative, game mechanics by themselves are not copyrightable. So it might come down to the extent to which OpenTTD's code was based on the reverse-engineered original code, as opposed to being a truly from-scratch reimplementation of the same mechanics. Visual appearance would also be relevant. Oracle v. Google would be an important precedent.