Trying to access Safari developer tools prints "Access not allowed (-1723)"
I do not have a menu item that starts with Simulator; however, using Experimental as in Experimental Features, the following example AppleScript code did retrieve the names of the menu items on the Experimental Features menu item of the Develop menu in Safari. (My system is set to US English.)

tell application "System Events" to tell application process "Safari"
    set menuItemNames to get name of every menu item of menu 1 of ¬
        (first menu item whose name starts with "Experimental") of ¬
        menu 1 of menu bar item "Develop" of menu bar 1
end tell

return menuItemNames


So if you change "Experimental" to "Simulator" and "Develop" to "Entwickler" I'd imagine it would work for you.