If you follow Nintendo and know the Nintendo market, this should be obvious. Investors, shareholders, and the customer base have taken a large hit as far as their confidence is concerned.
The Switch 2 hasn't sold as much as was expected. This isn't speculation, it's fact. It sold the quickest but it didn't hit the predicted numbers.
Mario Kart has hit its numbers but most of those numbers were packed Switch 2 sales. Donkey Kong Bananza did great but wasn't treated as the flagship it should have been treated as. Investors have called Nintendo out for their Key card practices and how it might impact 3rd party sales has been proven as fact.
The Galaxy and Pokemon games potentially not selling as much as expected is absolutely going to shake this already Rocky ground. Nintendo is not about to go into bankruptcy but they are not performing as good as they should be for having just released a console. It's not surprising their stock numbers are looking like a rollercoaster, but it absolutely should be considering they just released a new console.