I'd want an ereader as well, but when push comes to shove, I can read on my phone just fine. My Kobo Clara BW is small and light enough to be almost unnoticeable.
For me a bicycle is crucial for getting out and about, and I have done some long distance trips across continents with big mountain ranges to get over, with stove, tent and sleeping bag. This opens up a whole new level of 'minimalism'. Where possible, every item has to be 'dual use' to some extent, so that fleece hoodie doubles up as a pillow. Furthermore, every stupid travel gadget has to go, so no water purifier, no first aid kit, no 'stuff sacks', no special toiletries bags and no evening-only leisure clothes/shoes.
But this is luxury! The real pros are refugees. Imagine walking from Iraq to France, having to avoid every border guard, with no food in your stomach and just the clothes you wear as belongings.
In all fairness to the author of the article, the abundance of tech can be fully justified if he is a web developer and needs to make sure everything works on all of the devices that matter. That doesn't explain the Kindle, however, books (reading matter) has to be a priority item. From past experience, I would get rid of pretty much everything before getting rid of the reading matter.
I'd go iPad only, it's a versatile device after-all, but the truth of it is: it can't beat a laptop for "real work" (unless, real work is replying to emails and running an extremely cut down version of excel).
Yet, a laptop is significantly more awkward to read with or watch media. When flying I have (nearly) lost a screen to someone reclining in front of me while I was using my laptop; this is not an issue with iPads.
As it stands, the iPad is practically an essential, it's just so versatile and useful that it's omission would cut comfort more than it's weight. But I need an additional device, likely a laptop. One can't live without headphones either, and at least a smart-phone for payments, SMS and phone-calls.
So, it looks outsized, but a laptop can't substitute an iPad, and an iPad can't substitute a laptop (yet; it's a software failing mostly)
Certainly not a bad amount (5hrs) but enough that it becomes a conscious "I will have to charge this thing if I use it all day" thought.
I'm not trying to nitpick, this is genuinely what makes my brain hesitate.
Really the right answer here is a folding phone.
I don't think I'd be annoyed making calls with a tablet though. I'd just use bluetooth. For me the challenge would be that having no phone would mean I'd have to carry something bulkier everywhere. So, in conclusion, I have no great ideas and I'd be forced to do phone + light laptop.