It doesn't really matter. The key thing is that the constant bytes prevent a symmetry from forming in the block. So it matters that the string does aid such s

It doesn't really matter. The key thing is that the constant bytes prevent a symmetry from forming in the block. So it matters that the string does aid such symmetry. Making it a text string is just a flourish helpful to us humans. It makes it easier to see the lack of symmetry and trivially answers the question, "why those bytes?"