It can't be taken apart because you'll need something like a sewing needle to pry an axle out of a Technic piece? That seems trivially surmountable. I've had much larger problems just prying two small 1x2's apart.
I've got a 42043, Mercedes-Benz Arocs 3245[1] here which allowed me to reproduce this. If you look on page 322 (step #59) of the instructions at [1] it requires the same 4l axel to attach the bucket to its boom, and is held in place by a "bush" piece[2].
That one's trivial to take apart "correctly", but I just tried (without cheating!) by tightly showing the 4l axel in and gently prying it out with a sewing needle.
It took around 10-15 seconds, there's a tiny bit of external visible damage the size of the sewing needle head on the piece the 4l goes into, but I being careful.
Otherwise it's no worse for wear. I also tried it with a wooden toothpick, but the gap is too small for that.
I'd put that into the "annoying" category, rather than Lego having produced a "display-only" set. For comparison on the Arocs I had to spend 5-10 minutes gently trying to get a gear into the engine once with a chopstick without disassembling the whole front of the car after it fell off.
1. https://www.lego.com/en-us/service/buildinginstructions/4204...
2. https://www.toypro.com/en/product/968/technic-bush/light-blu...
It's still pretty notable that it requires a sewing needle to disassemble fully instead of just hands or a brick separator as previous sets did.
I then used the "bush" piece to hold onto the axle from the other side, so you have to pull it out of that piece to get the axle out. It's not the exact same piece that's holding onto the 4l axle in the article, but from experience they've got about the same hold on the axle, so the difference won't matter.
Yes it's annoying. I'm just pointing out that it's far short of the "can't be taken apart" claim in the article.
I'd be willing to bet that it can be taken apart conventionally. You can probably push the orange piece a bit from the other side.
Of course it will run right into the frame on the other side, but even Lego doesn't make components with micrometer precision, there's usually a bit of give in the plastic. If you can get some play in it of even a half a millimeter it'll be sufficient to do this with a toothpick instead of a sewing needle.
Beside using a knife, the only trick I've found to work for these is to stack longer 1x plates on either side of the pair, which give you more leverage on the center pair, while themselves being easier to take apart.
This:
A 1x1 in the middle of a large plate though can be a challenge though. While the remover tool works for e.g. 1x2s, 1x1s don't quite have enough surface area, so the tool often slips off.
2x plates I find tend not to give as much trouble, if only because they require more force to have been pushed together perfectly flush in the first place.
(My context is teaching Lego professionally to middle-school children for a few summers. You get given all sorts of fun things to take apart, and having a pocket knife around isn't a good idea. My other takeaway from that experience is that the LabView-based Mindstorms software is/was total shit.)