A tall back panel standing on a low console is, structurally speaking, a sail on a boat. It catches every knock and it has nothing above it holding it steady.
The answer is in how the panel meets the console, and it is not screws. The panel is built with two heavy stiles running its full height, and each stile continues down past the console top and is tenoned into the plinth frame below - passing through the console rather than sitting on it. The console top is then housed around them.
That means the load path runs from the very top of the crest straight down through solid timber into the plinth, and nothing is depending on a fixing into end grain. Push the top of the panel and the whole piece resists as one object.
The pierced gallery under the sweep is fitted last, once the panel is standing and squared, because a pierced element built in early would be carrying stress it was never meant to take. Fitted last, it carries nothing - which is exactly what a decorative gallery should do.