I found the following paragraph in the Tokyo2020 page on Sport Climbing
To prevent athletes gaining an advantage from watching others scaling the bouldering and lead climbing walls before them, each climber is kept away from the climbing wall before their turn and given just a few minutes to examine the wall and routes prior to starting.
So my assumption is that the Olympic officials/organizers for the event will have to set the routes at the time of the competition, without any pre-designs being written up (which could lead to unfair/unequal dissemination.) The walls would have many possible routes. Only at the time of the event would they actually create the route, and would sequester all competitors prior to the event, giving them "the few minutes" to examine the route.
This would not keep national teams from gaining pictures of the bare walls and setting up as many routes as possible within the connections, but the competitors would not know the exact routes until the event.
The next is in my opinion and mine alone, until I can find written evidence.
Of course, this would mean that the bare wall, without attachments set in routes, would need to be allowed to be viewed (or pictures disseminated) to all teams in advance, so no team has an unfair advantage over others.
If this ends up actually being the case, then it might also be true that all of the possible routes could be drawn up and disseminated in advance (or at least made public to all), but as long as there are a large number of possible routes then the deleterious effect of this pre-knowledge can be minimized as much as possible.