The article implies there's been a decrease in the median wage, but there's been an 8% increase YoY according the SSA. In real terms there's probably a net decrease in the median wage but nonetheless.

I just rose up to 100k salary and it’s still not even that much out of what feels like poverty

Most New American immigrants that come here do not have the intellectual capacity to contribute in the modern post-industrial society. This makes a sharp contrast with the immigrants of the 18th century that came here without counting on welfare benefits welcoming them. Since these new groups of people comprise 30 to 40% of the American society , we see the reduction of the middle class.