That's about the deprecated Thumb-2, this article is about ARMv8, they are wildly different.

I can recommend his articles to anyone interested in what they cover. It's very common to completely miss the bigger picture, or give an incomplete summary, when talking about processors and their design. If I can name names I've always found Lemire's blog anticlimactic - usually a good summary but not fleshed out until someone else comments with the juicy details.