That is very interesting, and I suppose it speaks to the historical amnesia among IT specialists, since I believe the majority of us don’t really see ourselves as belonging to the working class.
If the majority of your income comes from labor, as opposed to interest on capital, you are working class. The non-working class likes more divisions between the working class, so works to perpetuate this misunderstanding.
Maybe the above poster was referencing the startup founders and early employees on HN, who could be considered to not be working class, depending on their ownership stake and success of their company.
Car mechanics and manufacturers used to feel this way.
There are only 2 classes, the worker class, and the ownership class that doesn't really have to work (e.g. could stop working tomorrow and be fine until retirement/death)