But Israel never did say regime change was a primary goal, it was more something that would be great if it did happen but they couldn't make happen. Many, many Iranians were begging for intervention remember (though more from Trump as the US is more powerful).
From the article you linked:
If Iran’s new leadership keeps its grip on power, the long-term measure of the success of the conflict may hang on the fate of 440kg of enriched uranium which was buried under a mountain by US strikes last June, former and serving Israeli defence and intelligence sources said. Enough for more than 10 nuclear warheads, Iran could use it to hasten the construction of a weapon if the material remains in the country.
“These 440kg of uranium are one of the clearest litmus tests for how this war ends, whether it is a success,” said one former senior Israeli defence and intelligence official who worked on Iran. “We need to be in a position where either this material is out of Iran, or you have a regime where you are confident that it is safeguarded [inside Iran] in a very meaningful way.”
Hardliners in Iran have long argued a nuclear deterrent is the only guarantee of survival for the Islamic republic. The overwhelming military dominance of US and Israeli forces in this war is likely to bolster that view if the regime survives.
The US is reportedly considering sending troops on a high-risk mission to secure the uranium. Negotiations before the war also included proposals for Iran to surrender the enriched uranium to another country.