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Disclaimer: I have not watched "This is Financial Advice", so if I miss something that's covered there, my bad. Maybe I'll have time to watch it someday, but that day is not today.
Your skepticism is understandable. However, my expectations around future GME (the security) prices are not fundamentally about expectations around GameStop (the company). All GameStop needs to do is not go bankrupt (which they are doing quite well based on their cash on hand), and any future business success / profitability is just icing on the cake.
Rather than betting on some unimaginably successful 1,000x business transformation, I am betting against Wall Street. Fundamentally, valuation of securities works on the assumption that shares are fixed in quantity (or only created/destroyed by equity-preserving events by the issuer). With the ubiquitous rise of online brokerages, security entitlements, high speed trading, and a derivatives market that far eclipses the value of the underlying assets, that assumption is flawed and regularly abused by Wall Street to extract huge sums of wealth from investors and issuers. At the same time, Wall Street is laxly regulated and hugely greedy, and has no qualms about putting itself in risky situations for short term profit with the assumption that problems will be fixed down the road. Unfortunately for them, that situation has been threatened since the events of January 2021. Since then, all the evidence I've seen suggests that the financial institutions, many of them mutually liable for each others failures under the DTC or other organizations and settlement agreements, are regularly engaged in kicking the can down the road and perpetuating net short positions. However, since 2021 investors in GME have started removing their shares from Wall Street, meaning that eventually accountability will be required for naked short positions and then true price discovery can occur. Until then, price fluctuations only matter to help me understand how many more shares I can acquire.