Yup, they can re-roll to hit with their Grenades.
It does not say it only works if they use comparitive Weapon Skills (like a Wolf Tooth Necklace Does) so it works for Grenade Attacks. The ONLY restriction is that it does not work on models without a WS, which walkers do not not have (Ow my brain).
So in short: Yes, Preffered Enemy + Grenades = a Re-roll against a Walker whether its Stunned etc. or not.
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