Although BMX is such an easy sport for things to go wrong, one would have to be extremely dominant to be considered a safe medal, I'd say...
And personally I really can't see the Belgians as safe medals (gold even!) in the road cycling
Sure, they both have an excellent chance, but in the road race there's at least 20 riders who have an excellent chance, including some who are usually better climbers than Evenepoel and Van Aert - even though they might hold on of course, they are definitely among the 20+ riders with a good gold medal chance.
As for the ITT, they both have a chance as well, but the likes of Pogacar, Roglic (if recovered), Cavagna, Küng and so on are equally as dangerous, and that's not even counting on Ganna yet, who we can assume will be in top shape.