This is inappropriate, outdated and harmful advice.
Bleeding such as this should be investigated and treated rather than stripping the patient of necessary treatment.
Even if it were due to the HRT, the HRT should be adjusted by a specialist (if initial tweaks by the GP haven't worked). The answer is never to pull the patient off estrogen, unless a clear contraindication were identified such as endometrial cancer.
Which would only be diagnosed with investigation.
And even if the bleeding stops off treatment, do they just expect you to then suffer a miserable, shortened life with osteoporosis and all the other sequelae of untreated menopause?
I would see someone else and not accept this.