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No, If you use kindlegen to produce a MOBI, the resulting MOBI will have
1) The old MOBi
2) The book in KF8 (new mobi) format
3) Optionally, the original epub
Depending on what tool you use to "unpack" the mobi what you get can come from any of those 3 sources. If you are seeing a CSS file it is definitely not from (1)
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