Thanks for finally engaging and explaining instead of simply asserting that my position is incoherent.
God’s goodness is of course, possessed by God himself.
Normally, when we say that for example, John Harshman has a PhD, then the quality of having a PhD is part of John’s nature. But the quality of having a PhD doesn’t fully encompass that nature, because there are other qualities that are also applicable to John: being male, human, a certain age, ethnicity, nationality, etc.
With God, however, God’s goodness fully encompasses God’s nature, because God’s nature cannot be divided up into different qualities like John’s nature can. Other attributes of God, such as being just, loving, perfect, immutable, eternal, purely actual and so on - are not actually separate qualities of God (like John’s qualities), but just different perspectives of understanding the single, undivided nature of God.
Secondly, God’s goodness is also not an arbitrary, limited goodness, because God is perfect and his goodness is identical to his perfection, so his goodness is also perfect. Thirdly, because God is the creator of the universe, all the goodness in it comes from God.
These things are what I mean when I say that God is simple, and that God is goodness itself. I hope it makes a little bit more sense.