This is one side of the elephant.
It's true a steel inner strength is required in day to day engineering. It's hard, and it lacks positive reinformcement almost always. When you hear something it is bad.
But let's define "buck up" and see the other side of the elephant. That blog post is a textbook example of negative self talk. You can have a world that looks down on you and spit back at it and do your best work, but if you look down on yourself you _will not_ bootstrap your way out, because you learn to believe you cannot.
That is depression, and depression is reinforced if not caused by that self-talk. Addressing the self-talk and stopping the flagellation will allow that steel inner strength to build up. Medication is a parachute but the wings and engine need to be rebuilt using self confidence, and that's a long road of:
* reframing failures as lessons
* honesty with self about your own role in your depression
* careful build-up of support
* learning to find the important and good in each memory, vs the deprecating and painful
Too much therapy speak here. You can't think your way out of depression. Only by taking action can you change things. Fix your body first. Then learn to socialize. Then get good at something (ideally something you can make money from). Think in terms of systems not goals. As a man your only way out is action (I can't speak on the female side of things).
I think the point was that there are people who don't need all this extra work, it just comes naturally. And they are more suited to engineering than people who need to spend a lot of energy on emotional and mental regulation as well.