Well, I'm glad Leah is back and wish her a good start. But there are some elements in the text to be found under the second link I'm not so sure about. To get a quote:
By doing this, an agent (during shipping) cannot replace your HDD/SSD with another one with the same password, because they don’t know that password. Only you and RetroFreedom knows it, but then you change it after the laptop arrives and only you know it.
Well, that's not so good as only the user should know the passphrase and nobody else. Also I think it is better to flash and build the notebook by yourself instead buying it prebuilt. I did this once years ago with a supplier from canada and had some thoughts back in mind about using the system being trustworthy. Well, the notebook is in fact also today in usage, but all other systems were done by myself. So the absolutely first starting point would be having the people emancipated: Being ready to help yourself, which is a great possibility with free and libre software.
Besides those security modifications are interesting, but they also sound absolutely paranoid at some point and they won't be much of a burden for anybody being willing to crack the system. The only one I see being really important: An encrypted installation and this should be the focus for everybody! So helping others being able to do this.
Human being in favor with clear principles and so also for freedom in soft- and hardware!
Certainly anyone who has the power to make you believe absurdities has the power to make you commit injustices: For a life of every being full with peace and kindness, including diversity and freedom. Capitalism is destroying our minds, the planet itself and the universe in the end!