Sure it is a matter of time and also a matter of quantity, including front loading. A guy from 10 years ago could have bought $5 of bitcoin per week and invested $2,600 by now (over the past 10 years) and he would have accumulated more than 1 bitcoin.
From the article, the guy suggests $250 per week, yet I question if $250 per week would be enough to get to 1 BTC in 10 years.. and so if someone wants to assure to get to 1 bitcoin in 10 years, he probably needs to invest more than $250 per week.. perhaps more than $500 per week, and even that might not be enough. $500 per week would get right around $26k per year, which would be $260k over 10 years. Such a guy with $500 per week might be able to get to 1 BTC in 10 years or less. Perhaps? I would not have a lot of confidence that $250 per week would get a person to that level, yet at the same time, surely people have to work with what they got rather than fantasizing about what they do not have, in terms of discretionary income that they are able to invest in bitcoin in a sufficiently aggressive way, yet at the same time, without overdoing it and wrecking themselves in the process of trying to reach such a goal of getting to 1 BTC in 10 years.
Yes agree with you here, our focus should be on accumulating Bitcoin base on what we can afford, not by fantasying over things that may be out of our reach if we are a low income earner, because even if we are investing with an amount as huge as $500 per week, as times passes by, the unit of Bitcoin we might be able to get will be shrinking because Bitcoin is on the rise, by ten years time from now it might has gotten up to a million dollar, so the unit of Bitcoin you will be able to get when the price has risen that high will be very small, so it might be very difficult to accomplish if your discretionary income is not that much, so the proper thing to do is to buy what you can afford consistently without having too much of a fantasy in your head that may not be possible, so that you wouldn't be disappointed if not accomplished.