people that can't read instructions how things works
Pretty sure that's their point: If the instructions are too complex or intimidating, particularly if they're technically written, they may genuinely be unreadable to some users.
There's a certain effect where, if something seems overwhelming, particularly if you already feared it might be, that will be a self-fulfilling prophecy. And once the overwhelm starts, once it sounds even a little too complex for users to be confident in their understanding, the brain goes into panic mode and holds on to "aaaah I can't do this".
So yes, some people genuinely can't read instructions because static instructions don't talk to them, just at them, with no ability to respond and reassure if that panic hits. Human interaction often seems less intimidating because they can (ideally) respond to your confusion, reword just that part, hold your hand through the process, all of which instructions can't.
Throwing them into the pool and telling them to learn swimming doesn't help: It makes them want to leave. Learning to read docs is a skill itself that needs to be developed separately, but making it an entry barrier risks scaring people off before their investment of time and focus starts paying off.
and in this open source world everything minimum popular is well documented.
Are those docs written or proofread by noobs? My experience with tech people (including myself, unfortunately) is that we tend to think in specific trained (or perhaps intuitive to us) patterns that don't neatly map on how non-techies perceive and understand the world. If I try to explain something, I don't even know where there are parts that I'd need to simplify, explain differently, what metaphors I could use to help understand and so on.
Of course, techies do want those details I'd have to omit for non-techies. Some guides do really well with a "simple" and an "advanced" version of instructions. However, "documentation" doesn't always equal "guide", and some docs are really just a dry list of functiond and syntax, which brings us back to the topic of having to learn to read docs.
When someone asks me to teach them to learn to programming
...they're already past the first threshold of "This is all way too much, I'll never learn that". Anyone willing to engage with programming already has conquered - or never had - that initial fear of not understanding stuff. For them, docs might not be much of a barrier, and if they're well-written may be a good point for slightly more advanced stuff.
I'd argue they'll still need an initial intro to "how to think like a programmer" (or rather, "like a computer, and to solve backwards from that"), but in any case, they're not the target audience for "Linux as competitive desktop".
Non-techies are, and to them, tech may well be scary. We need to account for that and ease them in by whatever means work best for them, if we want them to come to us, not what suits us best.