Do you think people who earn a good amount of profit by investing in Bitcoin will stop to work? 
Numbers are infinite, people always looking for extra mile in order to make money. Someone who get a high salary and have a good amount of money could die after they start to invest in Bitcoin, the price goes opposite than what they expect.
There's no relation between health and Bitcoin investment, money can make you healthier and unhealthy, be wise.
Seems you are missing the point, he is not against working but against doing jobs that will take a ton in your health. I agree with him, many people are exposed to risk but for the sake of money, they ignore the signs. Some are doing multiple jobs with no time to rest and he is saying that such actions are not right because the results are normally felt at old age. Bitcoin in as he describe can help during retirement because if you actively invest in Bitcoin now, you will not have to work so hard when your strength begins to faith and there the chances that your money will grow as the price of Bitcoin rises. Numbers are infinite, people always looking for extra mile in order to make money. Someone who get a high salary and have a good amount of money could die after they start to invest in Bitcoin, the price goes opposite than what they expect.
There's no relation between health and Bitcoin investment, money can make you healthier and unhealthy, be wise.
But, although I agree that investing in Bitcoin can be a good retirement plan, it is not something sure. So maybe, in line with the opening thread, taking profits from time to time could help you live a life with less stress, without having to wait until that age. Look at what he said, he used to walk miles every day to get to work, but with Bitcoin's help he can work in a job with a lower salary but better conditions.
He said people always look for extra miles to get money, meaning that people takes things to the extreme to make money, like doing more jobs than their bodies can handle, there is no where he said that people walk extra miles to job, I think you should read again.
I like the idea that just buying Bitcoin and holding till old age can be unsafe, since we don't know what will happen at that very end but I think Bitcoin can last that very long, because it is not just a digital currency, this is the only decentralised currency that works, nothing else does it better, this is why using Bitcoin as a reserve is good, I doubt that Bitcoin will go away some day.
For safety option like you said, it makes sense to take profits while your bag is growing in value, at least have some money in Fiat set aside is not a bad idea, but at the same time inflation is real, so it is best to make your own decision that's best for you.