Yes, based on supported resources listed in this Microsoft article, Graph subscription does not support SharePoint pages, we could not get changes notifications of SharePoint pages through Graph API.
Currently, we have two methods to get changes notifications of SharePoint pages, OOTB alert feature and Power Automate.
1.OOTB alert feature.
Go to Page library -> Alert me -> Create an alert.
2.Power Automate.
Go to Page library -> Automate -> Create a flow -> See your flows -> New flow -> Automated cloud flow.
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