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Satoshi was still developing when the 1MB block limit was created
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Looking at github, it appears that the 1 MB block size limit was added in version 0.3.1 on July 18, 2010:
https://github.com/bitcoin/bitcoin/commit/9d2174b6f5f3fac2463c7ebc2dbb9004b3740d23#diff-23cfe05393c8433e384d2c385f06ab93R18Satoshi posted here in bitcointalk.org as recently as December 12, 2010 indicating that he was "developing" version 0.3.19:
There's more work to do on DoS, but I'm doing a quick build of what I have so far in case it's needed, before venturing into more complex ideas. The build for this is version 0.3.19.
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