No, because penetrating armor in the general sense doesn't cut it. As I said, the Genestealer needs to either get its ovipositor down the target's throat or get them to have sex with someone already turned.
You keep bringing up sharpened rebar, but even in this state the Aberrants should still have their giant power hammers, even if most of their power fields are weaker or even no longer functioning.
While, yes, Genestealer infection is possible, I highly doubt that it happened in this case specifically. It also wouldn't make as much sense to target Riona considering she would certainly be put through genetic screening after the campaign. If they were to infect anyone, civilians would be the best bet, since there's too many for them all to be checked up on.