Essentially, an ATAR of 99.95 can be achieved with any subject combination (including Earth and Environmental Science), as long as your performance across your subjects is of a sufficiently high standard. This means that the answer to OP's question is definitely yes.
Looking at previous HSC cohorts, the last time a student achieved an ATAR of 99.95 with EES as part of their subject combination was in 2010. In more recent years, the highest ATAR achieved by a student who took EES was 99.90, which was in 2018. Of course, the highest ATAR achieved by a student who took a particular subject and was part of a previous HSC cohort has no direct effect on the highest ATAR that can be achieved with that same subject in future HSC cohorts. It merely serves as a general indication of the ATARs that were historically achieved with the subject.
This data is from UAC, which publishes yearly scaling reports for each HSC cohort. These reports contain information including the highest ATAR achieved by a student who took any subject, which UAC typically refers to as "maximum ATAR" but has labelled as "maximum ATAR including the course" in its 2023 scaling report for further clarity.
I hope this helps!