Based on the name of the plan, it seems clear that this is a 401(k). If the box for IRA was checked on the 1099-R, then the plan administrator owes you either a corrected 1099-R or an explanation (like are they also administrators of your IRA?).
Yes, in many respects, the income from an IRA and a 401(k) plan are treated the same, but sometimes they are not, so you really need to look into this.
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