“The legislation also requires CISA to hire professionals with experience developing open source software to ensure that government and the community work hand-in-hand and are prepared to address incidents like the Log4j vulnerability.”
Have you noticed that the IRS website is accessible and searchable? That SBA is functional? Conpare that to, say, Department of Commerce, where things are a mess (currently).
The US realized it needed to pick things up a bit and, while it's still a hard space to work in, started to shift to a better playbook.
There's no way to actually know. Everything not based on the text of the bill is pure speculation.
However I'm not aware of any case law proving this.
States are where you need to worry. Occasionally a state decides to pass a law[0] saying they can't be sued for certain copyright violations. Because of how the US constitution is set up, states (and nothing smaller than them) are allowed to just say they can't be sued, which lets them crime with impunity.
[0] https://www.npr.org/2020/03/24/820381016/in-blackbeard-pirat...