Why does Szeth say this? I've started a reread of WoK and in the prologue, Szeth says the couldn't heal from a shardblade to the arm but we obviously see Kaladin heal from a shardblade to the arm in WoR and In OB when Dalinar gives the honor blade to bridge 4 Teft says something like one of these idiots will probably cut one of their feet but that they could heal from it. So who is wrong.
Sorry, I don't have the exact quotes I don't have my physical copies I lent them out and am doing an audiobook.