I think TFA is more stressing that this only "new" once perspective can lead you to exclaiming WTF a lot to all your new colleagues - thus giving the impression

I think TFA is more stressing that this only "new" once perspective can lead you to exclaiming WTF a lot to all your new colleagues - thus giving the impression of being a loud complaining nuisance. Instead, by writing it down and NOT expressing it just yet, you give yourself time to learn the lie of the land and why things are the way they are; to orient yourself in the workplace. And when you are comfortable, settled with accounts/permissions/authorisations, you have a nice list to move on. The team is then more likely to think you are being helpful rather than a popup muppet exclaiming "WTF is that!" all the time.