I think he is using the word "Job" for a person who do not have funds or a source of income. So those people can only job or provide any service to raise their income. Such people can't initially do business as it also requires money.

By the way, you need to have the motivation that you will save every penny and invest in Bitcoin
BTC. For example, you may decide to skip a pizza party and put that money in bitcoin. However, it seems that these small investments aren't profitable but collectively, one can accumulate bitcoins over a period of time.
It's not how much you are investing but how long you are willing to invest in Bitcoin. It's better to invest anything you have rather then not investing anything into Bitcoin. Moreover one must keep himself relax if he wants to keep on investing into Bitcoin for long term. Like it's good to have pizza party occasionally but eliminating such entertainment altogether from life will make things difficult and it won't help in long term Bitcoin investment.
One key thing that should not be undermine is that Bitcoin investment should be done in a relax manner, that's why the DCA accumulating strategy is highly recommended because you will have to do it on your own term, either slowly or fast, but one sure thing is that it should be done consistently, and putting down measures which will enable you to hold for a very long time is key, and those measures is having a source of income and an emergency funds that will be used to sorts out real life emergencies that may arise in the future which might threatens your holdings if not in place.
So what am trying to say is that any investment in Bitcoin that is not done in a relax manner, will hardly survive on the longer run.