Up until that time, Joe Biden was the President of the United States. If there were any changes or developments regarding his behavior after that date, I wouldn't be aware of them.
However, discussing the hypothetical situation you mentioned, it is essential to approach such matters with nuance and context. If any leader, including Joe Biden or anyone else, displayed problematic behavior, such as lashing out at a reporter and using vulgarities on television, it would indeed raise concerns about their ability to manage emotions and handle criticism effectively.
In such cases, it may be appropriate for individuals in positions of power to seek professional help or anger management training to address any anger management issues they might have. Seeking assistance from mental health professionals can provide valuable insights and coping strategies to manage emotions more effectively.
However, it is important to note that discussing an individual's mental health, especially a public figure like a president, should be done with sensitivity and respect for privacy. Without credible and verifiable information about a person's mental health status, it is not appropriate to make assumptions or assertions about their condition.
In the event of such incidents, it is up to relevant authorities, advisors, and the individual themselves to decide if intervention or counseling is necessary and appropriate. In democratic societies, voters, media, and public representatives can raise concerns and hold leaders accountable through various means, such as public opinion, elections, and checks and balances in government.
As my information might not be up-to-date, I recommend referring to reliable and current news sources for the latest information on any public figure's behavior or actions.