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wonder if the ship, after the last modernization, had armor plates instead of railings on the platforms of anti-aircraft guns?
It's a good question. I believe the answer is, it depends.
Postwar photos of late war built DDs such as the Matsu/Tachibanas, the later Akizukis, and the later Yugumos, show metal splinter shielding.
However, the photos of the few survivors & wrecks of the earlier classes, like Ushio & Hibiki (Fubuki), Hatsushimo (Hatsuharu) and Yukikaze (Kagero), show railings around these positions.