As of the latest chapters I've read, Megumi is still alive in the manga. Usually, such major character deaths are significant plot points and would be well-publicized if they occurred.
One common theme is the communication barrier Inumaki has due to his cursed speech and how the reader overcomes it or they find unique ways to communicate. Another is the danger and adventure aspect as they are often set in the Jujutsu Kaisen universe where there are curses to fight.
Well, Megumi's story in the manga was full of twists and turns. She had to overcome various obstacles, and there were also some unexpected developments in her relationships with other characters.
Nope, Megumi is alive. The author has chosen to keep Megumi's character alive to continue developing their story and interactions within the manga's world.