You can make any activity into a "meditative" sort of experience. All that's required is that you think about things while you do other things. Whether you call that "spiritual" or "psychological," there are benefits.
The monk who wrote that, btw, has some...um..."interesting" (by which I really mean "wrong") interpretations of certain Japanese characters used for Japanese words...I found it a bit amusing that he resorted to stretching the truth to try and make a point.
I have a book on spiritual house cleaning. That might even be the title. I would say there's a lot of wisdom in it--especially the idea of taking the garbage out more frequently.
For years now, anytime I have been flustered or feeling overwhelmed, I stop clean and organize my work station and the area around it. Something about it cleans out my mind at the same time. I don't really meditate. I always just thought that an orderly environment helped me feel in control again. Knowing where everything was on the outside made me feel like everything in my mind had been pulled out of the drawers, dusted off, and put back in a new order. I highly recommend trying it.
I remember reading about sweeping as a meditative technique in a Zen Buddhist book back in the 70s. I believe that certain Christian monastics often view their everyday tasks in much the same way.