The thinking behind this is solid if you are marginalizing all splenomegaly in thals as overload caused problems, or problems that specifically "develop" instead of being "congenital."
Many thals, including myself, have spleens that are congenitally predisposed to develop idiopathic thrombocytopenia, where the blood from transfusion may pool, and thus effect the transx's success. After having so many pooling episodes, your spleen may begin to catch healthy cells, mostly platelets, causing a quick splenomegaly and intense pain. It also forces your marrow to overproduce platelets (my platelets are still ranging 750-1000 2 months post op...normal range being <450)
Seeing as this partial splenectomy may make the spleen "smaller" even when splenomegaly occurs, I can't imagine the splenomegaly still wouldn't be painful (as your body would have adjusted to the smaller organ, maybe?) and it still won't stop the ITP like having no spleen would.
This procedure may work for some, but not for all, IMHO.
Thanks for the article, tho! It is WONDERFUL that they are at least TRYING new methods!