This quote "If a vehicle moves at combat speed it can only fire snapshots with its other weapons after shooting ordinance weapons" is not a rule, it is a mash up of two rules. 'if a vehicle moves at combat speed it can fire one weapon at full BS and the rest as snap shots' and 'if a vehicle fires an ordinance weapon the rest of the weapons must be fired as snap shots'.
The first one does not affect walkers, but the second does. So if they moved 6 inches they can fire all their weapons at full BS unless they have an ordinance weapon and fire it, then no matter how far they moved (or even if they didn't move at all) the walker has to fire the rest of its weapons as snapshots.
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