If “send_page_view” is set to “true” in the webGTM and the GA tag in sGTM is set up that way as shown in the screenshow below, does this cause duplicate page_view events?
It’s on you whether to use automatic page_views or have an explicit seperate tag for it. Having a seperate tag gives you more control (if and when you need it).
Server-side set up is not affected, the s2s tag the way it’s shown on your screenshot just inherits and send further any event claimed by GA4 Client.
You can set send_page_view to true, if you are already not sending page_view explicitly. Choose one or the other unless you have a specific objective in mind.