"Official A" is Karl Rove
On or about July 10 or July 11, 2003, LIBBY spoke to a senior official in the White House (“Official A”) who advised LIBBY of a conversation Official A had earlier that week with columnist Robert Novak in which Wilson’s wife was discussed as a CIA employee involved in Wilson’s trip. LIBBY was advised by Official A that Novak would be writing a story about Wilson’s wife.
Read it closely. It doesn't say that Official A is Novak's source. It says he had a conversation with Novak in which it was discussed that Wilson's wife was a CIA employee and that Novak was going to write about it. It doesn't say whether Offical A told Novak about Plame's CIA employement or whether Novak gave Rove the information.
How is this inconsistent with what Rove's team has previously said he told the grand jury? This New York Times article provides one such instance:
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