The thought that Chris Chibnall would excise the Doctor Who Christmas specials when he took over is a bit silly, although not completely unfounded.
The Christmas specials only became an official tradition when David Tennant took over as the Doctor in 2005, and they’ve become a bit of a pain for the creative teams in recent years.
Despite that, the specials always seem to do well by fans, and there would’ve almost surely been some backlash had Chibnall abandoned them completely.
Steven Moffat remarked last year that the show has run out of imaginative ideas for Christmas episodes, and that the team has visited and revisited just about every possible scenario the Doctor could tackle on the holiday.