I'm gonna jump in here but I probably shouldn't just because I have no hands on experience with wood drying yet. I have been reading any information I can get my hands on about this subject because I want to build a kiln for drying turning stock and maybe some boards for laminations but not no 500 bf.
In the information I have been getting if you ask 10 woodworkers on how to dry lumber you will probably get 15 different answers. The most negative I hear about air drying is the length of time it takes to try. Thats why kilns are more popular because the drying process can be sped up with a kiln if its done properly, same with air drying it to has to be done properly. The part about 1 year of drying for 1 inch of thickness is a vague rule to follow because every type of wood drys at different rates.Red oak dries faster then white oak. It all has to do with the molecular structure of the wood itself. Boards can warp,twist, and bow no matter how its dried or even if it was properly staked. Some of the stress and tension in wood can be controlled and some can't, that depends on how the tree grew, if the board was close to the pith,etc.
I don't believe his statement about the moisture content, the way way I understand it the would is gonna move when placed in a different environment any. The humidity in your where you make the project will stabilize to that environment then when its moved in to the house which probably has a different humidity, the will once again stabilize to that enviroment
I can't speak for the brittleness of kiln dried lumber because I honestly do not know. I also can not speak for the color lose of kiln dried lumber because once again I don't have information to support it or discredit it.
From what I have been reading, I don't believe that there is a right or wrong way between air drying or kiln drying as long as it is done correctley. You will find lots and lots of information from people who prefer a certain way because it works for what they are doing, weather its turning blocks,or 1.000 bf in a solar kiln, a dry kiln,dehumidifier kiln, or air drying they all get the job done