Ukrainians have already crossed the river because it is shallow during this part of the year. People and vehicles have no trouble crossing it at any point, so it is not a defensive barrier for the Russkies.
The Russians seem to be giving up territory too easily.
Russian BS about this being a genius trap can be disproven just by one look at the massive amounts of ammo and heavy hardware being left behind. The Ukrainians have even recovered some of Russia's most advanced tanks, apparently abandoned because they were too slow.
I think most would agree that the “News” about the war should be taken with a grain of salt.