It took me a little bit to realize that this wasn't satire...I actually had to read it twice, once, thinking it was satire and chuckling along, and then, I went back to re-read upon realization that he's serious (I think).
If I'm going to take the author's post at face value I'll conclude that 1) (minor point) he's not reformed...or Catholic, because home-brewed ale and/or wine would quite possibly be the drink of choice for sermon writing. At least it is for me when crafting liturgy/songs/etc. and 2) (main point) his real complaint I think resides, not ultimately with coffee, but with over-work and our modern, as he puts it, 'work-life balance'. That's the real idol. He has a point if he lingers on coffee as being a status symbol, but he only briefly addresses that. I think coffee is getting the shaft here. Smells to me like a fundamentalist, damning the symptom and not the source.