Did Namor know what he was giving Shuri?

When Namor gives Shuri the bracelet from his mother, you first think it’s just a gesture of kindness. Which it is. But later in the film, Shuri uses it to crack the code of the heart-shaped herb, giving her the ability to unlock the power of the Black Panther, unite her country, and as a result, defeat Namor. If you think of it, he created his own worse enemy with the simple gesture.
But Namor isn’t that dumb. And really, if you think of it, giving away something so precious is almost too generous of a gift. Namor just met Shuri. Sure she’s awesome and royalty, but to give her something so personal from his own mother doesn’t quite track. We wonder if, maybe, he was really trying to help her and it went too far. We can’t say for sure but obviously it’s interesting to think about.