True, I paid it a visit and made a picture of the inscription. I have never really noticed it yet. :) There is more apparently... https://commons.wikimedia.org/wiki/Category:Friedensweg_Donauinsel but apparently there is not much information to be found about them apart from the inscriptions - and there is none for the "Krieg" sculpture left unfortunately. Most of them should not have any names tagged IMHO - definitely not those invented by the wiki commons contributor(s).

I have added all information I could and think that this issue is resolved. Thanks Mamutinka for bringing it up.