Dedo of Goseck - was he married with Ida af Elsdorp ?

[Sjostrom]

It has (I think) long been recognized that one of the husbands of the great
heiress Ida af Elsdorp (Elstorp, Elsthorp, Elsdorf), daughter of a family
who held lands in the lower Elbe [and apparently thusly Ida held lands in
the mouth of Elbe river, presumably held also Ditmarsken], was named Dedo.

However, I thought that nothing was reliably known of the antecedents of
the said Dedo the husband.

Now I encountered some genealogy floating in the internet, where Dedo has
got parents and ancestry....

I thought that a certain Dedo, a brother in the Goseck family (seemingly he
was attested as brother at some instances), was not identifiable with any
marriage nor with any progeny.

Further, the genealogy floating in the internet has -not very amazingly-
made that Dedo as one of ancestors of the floater of the genealogy,
alleging that of all the husbands of Ida, it was precisely just that Dedo
who would be the father of Ida's known daughter Richeza, who became
countess of Aldenborg. That it is known that Richeza was daughter of Ida,
is clearly based on later inheritance claims from progeny of Richeza to the
properties of Ida af Elsdorp.
I thought that current genealogical research still has the view that it is
not reliably known which of Ida's husbands was Richeza's father.

So, are there newer findings in contemporary sources?
What is based on that identification of specifically Dedo as Richeza's
father and Dedo as of Goseck ?