In Rhythm of War, Notum tells Adolin that:
“Deadeyes can’t make choices,” Notum said. “They don’t have the presence of mind for it. I know this personally. My own father is a deadeye, cared for in the fortress now.”
Is this a mistake, conflating Captain Notum with Captain Ico? Notum's father would've been born centuries or millennia after the Recreance, going off what Notum says in Oathbringer:
“The Stormfather created only a handful of children. All of these, save Sylphrena, were destroyed in the Recreance, becoming deadeyes. This loss stung the Stormfather, who didn’t create again for centuries. When he was finally moved to remake the honorspren, he created only ten more. My great-grandmother was among them; she created my grandfather, who created my father, who eventually created me.”
So if he's become a deadeye relatively recently, it's surprising they didn't use him as an example instead of Testament.
On the other hand, Ico's father is definitely a deadeye:
Ico locked the door and hung the keys on his belt. “My father.”
“Your father?” Adolin said. “You keep your father locked up?”
“Can’t stand the thought of him wandering around somewhere,” Ico said, eyes forward. “Have to keep him locked away though. He’ll go searching for the human carrying his corpse, otherwise. Walk right off the deck.”
Notum did not get conflated with Ico. Ico's father is not cared for in Lasting Integrity.
But the quote from Oathbringer apparently was forgotten. We'll have to address this sometime in the future.