If a project targets a high-profile, very security sensitive project like the linux kernel from the start, as the archived tukaani web site linked above shows, it is justified to ask questions.
Also, the exploit shows a high effort, and a high level of competence, and a very obvious willingness to play a long game. These are not circumstances for applying Hanlon's razor.
Also, the exploit shows a high effort, and a high level of competence, and a very obvious willingness to play a long game. These are not circumstances for applying Hanlon's razor.