Pap Smear Results

63(f) had 1B1 CC in 2016. Had radical Hysterectomy and since then all's been well. Had a pap every year, normal, HPV negative. Just had a recent pap and the HPV was negative but "insufficient cells for pap smear". Thought I needed a followup to retest, but my OB gyn said that at my age, had a RH and post menopausal I didn't need one, and we will retest next year. Does this sound correct?