Very cool ! I'm happy this comes from fellow french men. Of course, this comes still at a pretty high cost and you need to have the tools to do it but it's pretty usual for the "hackers" to have those things around anyway.
In any case even with all the added complexity/cost from different providers you still come out 2 times cheaper than Apple, which is completely crazy considering they definitely don't pay the NAND modules as high and don't need to pay for a special reverse engineered board.
This is what leaves a very bad taste in mouth with Apple stuff. Even with all the absurd amounts of money they are making on base devices they still can't help themselves and price basic stuff in a predatory way.
Everyone would be completely fine with a little bit of markup, but it currently is at an insane level.