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Yea, unless something has changed that im not aware of. server idle time was for RDSH aka Xenapp. Session Idle timer is for xendesktop . Use the rdsh GPO settings for xenapp sessions timers. Then use session idle time for xendesktop single OS workloads in studio as an example

Server idle timer interval: This setting determines, in milliseconds, how long an uninterrupted user session is maintained if there is no input from the user. [sounds like this is for RDSH/XenApp] Session idle timer: This setting enables or disables a timer that specifies how long an uninterrupted user device connection to a desktop is maintained if the user supplies no input. [sounds like this is for virtual desktops aka XenDesktop]

as stated above, one is for Windows Server and the other for Windows 10/11 (Desktop OS).