The line from Beast is very intentional. He didn’t have to mention Charles. As has been proven in the X-Men ‘97 series, Magneto also served as the team leader in the wake of Xavier’s death.

X-Men to join MCU post-Avengers: Secret Wars. Jesse Plemons eyed to play Beast. Marvel seeks younger cast for X-Men roles. The X-Men are beloved superheroes and have always proven popular ...

Marvel is apparently considering recruiting the Civil War star in the upcoming retelling of X-Men as the ape-like superhero with a genius-level intellect, better known to fans as Beast.