Yes, that's right. We'll see if that was a temporary test put on Thor by Odin - making him seemingly powerless without his belt. And someone was holding the hammer afterwards. Now that Thor has returned to Earth to fight Loki openly, we'll see his full might, I'll bet.
Interesting that Solomon Grundy was co-created by famed sci-fi author Alfred Bester ( 'The Stars My Destination'), way back in 1944 according to Wikipedia.
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"I'm not smart so much as I am not dumb." - Harlan Ellison