"The investigation into the cause of the starboard propellor shaft fault found that there was an installation error. More specifically, Wallace added that based on “initial reports” the shaft was misaligned by as much as 0.8mm to 1mm. “A tiny amount that, of course, can make a huge difference at sea,” he explained."
In the CCTV documentary on 054A, installation tolerance for the propeller shafts was stated as 2mm.
Every installation has a tolerance range. Misalignment is the error beyond that installation tolerance. In your example, the 0.8mm to 1mm are the errors, not the tolerance which is unknown.
You should not just pick a nice looking number and interprete it in your favored way.