The market prices for these banks made it clear that major investors either didn't read or didn't understand the data in the public filings.
That's impressive work, but I interpret that a little differently. There was definitely irrational exuberance going on, but plenty of major investors understood what was happening well before 2008. The reason the valuations were still out of whack is because having the correct data and the correct analysis isn't enough, you have to correctly forecast how the market will react. So there was an unfortunate feedback loop: many investors savvy enough to see the problem were not betting against it because there are far easier and more consistent ways of trading profitably.
This is why the most successful funds don't really try to replicate the process you're talking about. Their process is data and hypothesis agnostic. A lot of their work happens to align with the sort of analysis you've described here, but they don't start from the same place.