I received the exact same email.
I would accept their offer on 2 conditions: (1) a guaranteed Monday ship date and (2) overnight shipping as opposed to 2-day.
If RS is so sorry, why don't they offer these two conditions or else offer some sort of extra discount to show they are truly "sorry."
I don't want support vendors who are not honest about their inventory. For RS to ship 2-day delivery would just speed up delivery by perhaps one more day.
I just don't think they are all that serious about apologizing!