Im fairly sure this trinkets proc rate is bugged considering over a 4 minute ish fight it proced 11 Times now it may be just amazing RNG on his part but considering it has 0.92 Procs per minute and it procs 11 times in 4minutes points me towards bugged. Another log I have seen was 7 Procs within 4min 48 seconds and another 4min 36 second fight had 7 procs.
It could just be Rng is Rng but still dont be surprised if it gets nerfed.