It will be a cap savings move. Good work by Mickey.
Here is in-depth analysis by the the over-the-cap staff
https://overthecap.com/the-salary-cap-costs-of-trading-marshon-lattimore
They will very likely trade him by the end of August or by training camp. It's too risky to the cap to carry him into 2024. If he gets hurt, he's too old and way too expensive to mov. There's a single window here they are unlikely to bypass.
Moving an aging expensive vet is a sign of a team that truly wants to get healthier financially.