I seem to be reading a different meaning into the threads you linked.
Here in December 10, Satoshi only hint to the block size was; "...Bitcoin users might get increasingly tyrannical about limiting the size of the chain so it's easy for lots of users and small devices.", meaning that he anticipated there would be a resistance to any increase in the block size for the obvious reasons.
And reading a bit about the history of the blocksize limitations here, there existed such a debate, both for and against an increase.

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While this post by Satoshi does not explicitly mean a change of mind imo, there's nothing wrong in changing your mind with more information and after trying out the first proposition. Bitcoin has been a work in progress for a number of years.