VS 5.0
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Looks like there's two in the valley (see pic), and they sit under the intake runners so yes the heads would have to come off. Timing chains shouldn't really have to be replaced but maybe it's a 'while we're there' job because so much of the engine has to come apart. Can't really say I've heard of this being a problem before, did they at least call you to ask or did they just perform the work?
Hard to say if the RAA guy was correct (sounds like a reasonable assumption though). Maybe ask for pictures if they haven't performed the work yet.
View attachment 218228
That piston