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"Any hits that beat the Armor Value of a mobile skimmer moving more than 6" in its last movement phase count as glancing instead of penetrating hits." (69, emphasis added)

An immobilized skimmer is not a "mobile skimmer moving more than 6"..." It is an immobilized skimmer that moved more than 6" last turn.

So is it correct that, from the moment that the skimmer is immobilized, it can be penetrated--even by shooting that occurs subsequently in that same shooting phase or an assault that takes place in that turn's assault phase?

I would agree with that statment. If that phrase was not supposed to have that meaning, the inclusion of the word mobile is unneccesary.

If you look a bit further down you'll see that I have already asked this question...

Ooops, sorry Meph.

My personal view on this is that any shooting that occurs in a later batch or CC attacks occuring at a later initiative step would treat the skimmer as immobile, but not hits from the same unit shooting or initiative step.

The inclusion of the word "mobile" is noteworthy. It creates the effect Flavius describes, and it's also somewhat awkward in the sentence, suggesting it was included specifically to have that effect.

I think the RAW and intent arguments both suggest that subsequent shooting in the same round can Pen the Skimmer.

It makes sense anyway, the skimmer has just been shot down and is now on the ground. Any shots happening later are shooting a wreck on the ground and thus can penetrate it.