I wouldn't go for this combination, especially after being out for months with back problems.
But, as compensation he will not be mountain biking for the next few months. In that respect, the entourage has finally realized that combining and practicing together (cyclocross), road, mountainbike, road again, mountainbike again, during the same season, is very taxing. And I hope that the so-called connoisseurs who thought that it should be possible, despite the long-term back problems, will now apologize. After denigrating the real connoisseurs who criticized the impossible combination. An impossible combination, not in terms of talent or physical ability, but in terms of physical load, injurys etc.