Two possibilities:
1. Most realistically, Footlocker is not happening this year and an announcement is coming in the next few weeks. Why? Too many states not having a high school XC season, too many states (including western region and championships location California) still with limits on the size of gatherings, and sponsors are worried about bad PR and legal fallout should someone get sick.
2. Very speculative based on some rumors - NB and Footlocker are trying to cobble together a combined individual and team championships since Nike canceled NXN. They are exploring costs, logistics, a possible championship venue change to a state like Florida or Texas, and any potential legal liability issues that could arise if things go sideways. They would love to steal Nike's thunder but, it might be too late to organize such a thing.