If anything, this confirms it for me. On his about page, there's this:

"Hi there, I am Loïc Baumann, I’m from Paris area, France I develop, since early 90s, first assembly, then C++ and nowadays mostly .net.

My area of interest are 3D programming, low-latency/highly-scalable/performant solutions and many other things."

Compare that style to what's in this most recent blog - mildly ungrammatical constructions typical of an ESL writer, straightforward and plain style vs breathless, feed-optimized "not x, but y", triplet/rule of three constructions, perfect native speaker grammar but an oddly hollow tone. Or look at this post from 2018: https://nockawa.github.io/microservice-or-not-microservice/ It's just radically different (at a concrete syntactic level, no emdashes). I'm sure he has technical chops and it's cool that he worked on DOTS, but I would bet a very large amount of money he wrote the bullet points describing this project and then prompted GPT 5.3 to expand them to a blog post to "save time".