He is not the LT. He is something else. He is a merger of Order and Chaos that is held together by the In Betweener. They became something new with great power.

LT sought to ensure balance and judgement. Logos seeks to define the order of things in the first place. It sees the new shifting hierarchy that Galactus and the LT referred to and seek to define it themselves.

Order and Chaos killed the LT, or this version of it though. And Logos seemed to revert Galactus back to the Devourer. However, this is not clear yet. As his color scheme seems to have returned but his word bubbles are still the color of Lifebringer. So we need to wait to the next issue to see if it will stick.