Or that the author of the article and his infosec company has connection to the Chinese government, so he asked the Chinese security service to do an inside job

Or that the author of the article and his infosec company has connection to the Chinese government, so he asked the Chinese security service to do an inside job, and he would expose it later to increase the sales of grsecurity, which in turns support the secret service... It is one of the only few logical conclusions one can draw if one insists on OP's opinion that the Chinese attackers are playing 4D chess. The chance is non-zero, but doesn't make much sense.