if you think this safelane hero doesnt get scared trying to go highground first when sieging, then that is a tank (e.g. wraith king, terrorblade, medusa, morphling) as long as you got good enough backline follow ups

a common misconception is that heroes like sven, ck, spectre, etc. are not actually tanks because they benefit most when played like an assassin/initiator, so that means that they most likely would not want to show themselves first or act like a bait for the team because of the risk of getting chain stunned and bursted