What is there to suspect in that? It's plain clear from Elop's words. A nascent platform would of course make more concessions than a well established one. Nokia needs the money to see through this year and has monetizable assets like Navteq/Ovi maps in Europe and Asia that Bing lacks.
I can't help but suspect Microsoft needed Nokia more than Google (read: was willing to pay more for the deal), which was what caused the partnership.