This indicates that 'web page' latency is nothing to do with redraw-duration, but more akin to network-latency, but for the page as a whole. In comparison to redraw-duration (which is entirely client-side, web-page latency is the time to transit the network... i.e. latency.
In all the above cases, 'latency' is the delay between the stimulus and response, not the processing time.
I'll leave you with the top Google result for 'latency':
"Latency is a time interval between the stimulation and response, or, from a more general point of view, as a time delay between the cause and the effect of some physical change in the system being observed."
This indicates that 'web page' latency is nothing to do with redraw-duration, but more akin to network-latency, but for the page as a whole. In comparison to redraw-duration (which is entirely client-side, web-page latency is the time to transit the network... i.e. latency.
In all the above cases, 'latency' is the delay between the stimulus and response, not the processing time.
I'll leave you with the top Google result for 'latency':
"Latency is a time interval between the stimulation and response, or, from a more general point of view, as a time delay between the cause and the effect of some physical change in the system being observed."