The Discussion https://www.geni.com/discussions/241542 was started by a great grandchild of Herbert (MSB) Bloom to know why the tree on Geni "shows Herb's parents as Rosenberg".
Two of us, myself and Lisa, report having tried hard to find any documentation supporting that, and having failed to find any.
That discussion was started Nov. 2021 and there have been no new comments since May 2023.
Moreover, the only posts since 2021 have been in support of an alternate idea about Herb's parentage, first raised in that Discussion the last day of 2021: https://www.geni.com/discussions/241542?msg=1532954.
(I created a separate Discussion to look at and discuss that theory: https://www.geni.com/discussions/265938 )
Herbert (Herzl) Bloom has a duplicate purposely created by Customer Service.
Nobody has ever reported finding any documentation supporting the idea Herbert Bloom (either version) is the son of Rosenbergs.