That article only says Sharon (who was only a part of the government) opposed occupation, and even then was quiet about it. Also the article is completely unsourced.
Sharon was the Prime Minister in 2003 which is some 'part of the government'. Author is well-connected judging by his resume. Also see this where the reporter says he talked with "three sources with direct knowledge":
https://forward.com/opinion/217842/how-bibi-and-bush-made-a-...