I'm not a lawyer or any big time investor, but this whole lawsuit seems completely demented to me.
First of all, buying shares in a company is a gamble, and unless the company is intentionally devalued specifically in order to cause losses for investors, I don't think they have any grounds for suing, to be honest. And what CDPR did seems like a terrible business decision to release a broken game on console, but releasing a broken game is not a crime. And it's very, very unlikely that CDPR management literally manufactured this outcome to devalue their shares. I don't think they're that competent!
If I buy Apple shares, and Apple rushes out a new line of iPhones that explode and have to be recalled immediately at a huge cost (therefore hurting Apple's shares and my investment), the joke's on me for parking my money with them. Consumers can sue for damages if their phones spontaneously explode and cause damage to health or property, but investors just need to take the financial hit for choosing the wrong place to invest. When the pandemic started, global stocks took a massive dive. Will you go and sue the companies you invested in because they failed to prepare for a pandemic (i.e. retail)? It's just plain old incompetence mixed with chance events that trigger a perfect storm.
Unless CDPR did something illegal and intentionally tanked their shares, this is not likely to work at all. I wouldn't even be so sure as to assume CDPR and their business heads saw all of this backlash coming in the first place. It's not like CP2077 would be the first broken AAA game released without any significant consequences, and I wouldn't blame them for thinking it would blow over.
Besides, the game sold really well, and is by no means a commercial failure. I'd say CDPR stocks were inflated in the first place, and there was always going to be a correction after Cyberpunk's release, with or without a botched console launch. There's no way the game was going to deliver everything people imagined it to be. So take a look and learn a bunch of lessons from this situation. One of them would be to simply not invest in crazy overvalued stocks, and if you're so risk averse that you feel robbed after losing money, maybe just use passive index funds next time? Seriously, these people need to grow up. And I'm not even defending CDPR...