Was that the only difference in the purported habitat?
Oxygen is essential to carbon based life and, ar the same time, highly reactive. The production of free oxygen by algae was consumed by iron in the oceans for millennia. Free oxygen allowed the expansion of carbon based life and could only take place after the formation of the banded iron deposits. This study, looks at the expansion of shallow ocean environments friendly to our life form.
Of course there are a multitude of other conditions that had to be met like relatively stable temperature and lower levels of volcanic and meteor violence.