Several details have emerged about this. According to Mark Madden, a well-known Pittsburgh journalist, the Quebec-born defenseman indeed requested a trade to continue his career in Montreal.
Letang's request is said to have occurred in the summer of 2022. However, since then, the player, who has been with the Penguins throughout his career, signed a six-year deal worth $6.1 million annually, lasting until 2028.
This is a substantial contract for a team in rebuilding mode like the Canadiens. While one should never say never, it appears that the possibility of Letang moving to Montreal is now a thing of the past.