Transient aphasia and right side numbness, silent migraine?

New here and looking for help. My husband (65y/o) started having mild intermittent numbness in his right leg in 2017 and later progressed to his right arm. Not debilitating and not often. In 2020 he had an acute event of right side numbness, difficulty speaking and was taken to the ER. All symptoms resolved quickly and all scans and tests were clear but they diagnosed him with a TIA. Cardiology found nothing exceptional except age-related atherosclerosis. 30-day Heart monitor results were unremarkable. He saw 2 neurologists, one had no answers but the other one diagnosed silent migraine and prescribed low-dose propranolol. After several months, the right side numbness continued and they stopped the medication. In January 2023 he had another similar event. All symptoms resolving quickly but we went to the ER just in case and again they diagnosed TIA. No specific treatment except for lifestyle change (he is a smoker). April 2023 he had another event with "electric" sensation in his right arm and difficulty speaking. These events last less than 30 seconds but another trip to the ER with no further treatment. We saw another neurologist who is a TIA specialist at U Chicago who rejected the TIA diagnosis, checked for seizures (negative), couldn't give a diagnosis but recommended a neurosurgeon for his chronic c-spine stenosis. September 2023 he had involuntary arm movements only that lasted seconds. October 2023 he had difficulty speaking (couldn't recite the alphabet past "h" and couldn't enunciate certain words) that lasted ~10 minutes. Neurosurgery appt today was negative for any c-spine involvement with these symptoms. Since the event in April, he has chronic right side tingling and numbness, fatigue, brain fog, and has subtle word finding and speech difficulty (he says "like my jaw doesn't want to work"). Never any headache pain during these events (although he did have painful headaches as a teenager). Does this sound like a silent migraine? Anyone else have similar stories?