wod0bow
I admit I didn't read the whole document, but from what can I see, the aim of this act is mainly focused on telecommunications.
On this regards, if your ISP is giving data to authorities after a judge give their consent, GrapheneOS cannot prevent your ISP from making a copy of your traffic and lending it out.
In that case you should start to use something to protect yourself, like TOR, or a commercial VPN, or just some encryption for things you need the most.
Also, it seems in this act they are talking mainly about investigations more than a broad and constant monitoring (?)
GrapheneOS though can help with device access.
There are already some settings you can use, like the behaviour of the usb-c port or the like.
Also, maybe you might be interested in setting a duress pin/password.