Could be both lion but the dementia aspect is one that absolutely no one can fix and so the most worrying.
Following that Twitter user is quite enlightening as folk experienced in dementia treatment have pointed out the deterioration in his walking (not picking up his feet and shuffling, increasing difficulty with stairs), uncontrolled spasms linked to moments of verbal incoherence, and his dependence in leaning on the podium when speaking - he no longer does his various hand gestures at his rallies. He isn’t playing golf as much. His vocabulary is getting even worse.
If he is being medicated to try and manage dementia and/or other neurological issues such as stroke or TIA, they will come with their own set of side effects and knock on symptoms.
I am beyond feeling about Trump now. My ire is towards all the enablers putting power ahead of country in not admitting he is not fit to be President - on competence, health and criminal grounds.