I would first say to his family and friends that I am very sorry for their loss of this young man taking his life. Every life loss diminishes all of us.
Then I would understand that my father was about this man's age when he was shipped over to North Africa to fight in WW2, and he returned to his home state after the war with the polio epidemic in full swing. At times the communities went months with everything shutdown and everyone staying at home with no travel in or out allowed. This included the delay to continuing his education when the state university was shuttered for a semester.
After this I would think of what my dad would say in summary about this young man committing suicide -- his summary would be that this guy made his own decisions and that is where the responsibility rests.
It is likely that this young man had mental issues for an extended period of time before COVID-19 showed up and attempting to blame COVID lock-downs is just deflecting responsibility for his lack of earlier recognition & treatment for the issues. It is a difficult situation for his family and friends -- and hopefully they will think of supporting causes such as the "Walk for Hope" (like I do) which raises money for the research & treatment of mental illness.