There are plenty of devices in humans that do qualify as transhumanist addons. I mention them in the post.
Both transhumanism and singularity are treated scientifically as part of the same problem.
Never in history technology has resulted in less work. With the advancement of the computers we actually work more, we are more and more busy, produce more and multitask even more than ever before.
It is a myth that technology reduces labour or eliminates jobs. Since the industrial evolution the amount of jobs has exponentially risen and leisure time has been significantly reduced.
History in this case is no indication of what's gonna happen in the future. Machines evolved but they always needed human operators. Self-operating machines are a game changer and obviously will need drastically less human operators.
Self operating machines means that more jobs like "social media manager" and "occupational psychologist" are going to pop up.
Much like someone in the 1850's could not have envisioned that people would actually die from overworking in front of a glass that emits light (computer induced stressed work e.g in Japan) in the same way you can't even fathom the ways we will busy ourselves when we are all free from manual labour (which is not a bad thing).
One thing is for sure; technology has a positive correlation with occupation. Why? Simple. Every problem solved creates a series of other problems. Exponentially. It is how an evolving universe functions and we are caught in this rat race trying to catch up with ourselves.
The problem was never manual labour. That's pointless. Heck it is good to move around considering we are practically dying sitting on our asses.
But hasn't there also been a shift in what is needed to get and hold a job? What about those that for whatever reason can't be trained or educated towards the new jobs that pop up after the jobs for the moderately or unskilled workers have been automated away, the not-so smart? They don't disappear along with the unskilled jobs.
Don't these other problems become more and more complex, so that fewer and fewer people can solve them?