I skimmed the article. The wireframe mockups I was doing in Fireworks but now I use Affinity Designer though I also do physical mockup magazine style where you have physical mockups on paper and collage form where I move things around on a table to get ideas and see what fits and doesn’t. Then I take that into Designer and mess with colors and final placement. Though the end my workflow seems to be similar to that article maybe minus the physical part, I just skimmed the article so missed some things.