I appreciate your confusion. He's saying that once you compute the lead angle for a given target, that's all you need to know. Of course it seems a bit silly to say "it doesn't matter the speed" since the lead angle only applies to the result of target motion which is a direct function of its speed.
The speed does matter, but that's what the lead angle computation is for. Assuming your lead angle is still valid you don't have to mess with any TDC dials, including speed, because you've basically done the old TDC-less WWI method instead.
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