The big difference is that in 2021, there was no 'race fixing' as apparently happened in 2008. So a very different situation. In Singapore 2008, the race was manipulated by Renault and Piquet acting illegally by cheating, whereas in 2021, no driver did anything wrong. That was entirely down to race officials cocking things up. And that wasn't as a result of anyone trying to fix the race either; Massi was getting grief from both Toto Wolff and Christian Horner, so panicked and tried to give the fans the spectacle they expected, rather than a damp squib of the race finishing under theSC. Cos that would have been pretty boring. let's face it. Sure, Hamilton would have won the DWC 'rightfully', but Verstappen won it 'rightfully' as the drivers can only react to what's happening around them. There was no foul play, no deliberate attempt to cheat by anyone. So no need to 'look at' 2021's result.
The legal bid will fail in delivering the 2008 DWC to Massa. I think he expects that. But I also think he has the right to have a moan. But then just move on. It's a shame for him, especially considering he actually won more races than Lewis, but that's life unfortunately.