Nop.
You NEED the power39 kernel image for this also (yes, version 39 has been releaded)
After update in Maemo, download the deb package again from here.
You need to extract the zImage-2.6.28-maemo39.fiasco file, copy it to /boot/multiboot folder and rename to vmlinuz-2.6.28.10power39 (asuming you put ITEM_KERNEL=2.6.28.10power39 as Cofee says).