No, this is canon to them...

When you’re divine but also damn fine! Soaking up sum divinity.

“Either you have an enviable memory, or a pitiable life, to know nothing of regret”

It was damn painful for me to realize that Sotha Sil seems to be the only one person in Tribunal who really regrets about what they done to Nerevar. Vivec rewrote history thousands of times, in some of them he is the lover of Nerevar, in others his savior, in the third his student. Almalexia apparently decided to get rid of her husband’s memories.

And … and, it seems, only Sil realizes what they have done.

Also I have the big headcanon that “heart” in the  Clockwork City… its actually the heart of none other than the Sotha Sil himself. He slowly replaced parts of his body with metal so that the loss of such an important organ would not become a problem for him. He promised himself on the day of Nerevar’s death that death of his beloved friend would not be in vain, and that he would protect they people at all costs. 

“You should rest more often, my friend. A tired mind makes puzzles out of even simple things.”