As an anecdote, my grandmother was in a nursing home that went on lockdown. She was stuck in her room all day. Developed a blood clot in her leg from sitting constantly and that killed her. Pretty hard to attribute that to COVID but… I kind of do?
But since this is considering 'excess' deaths, wouldn't any there need to be an explanation for the temporal increase vs baseline for any non-COVID causes that would explain the excess?
Indeed, but they don't always peak over the same period. Any alternative theory has to provide a plausible explanation for why all these other causes of death (which presumably were also causes pre-COVID) all of a sudden decided to spike/ramp up and periodically surge again (against the pre-COVID baseline).
Your first point would be a contributor to a surge coincident with lockdowns, although even for that cohort some/many of those would not have occurred straight away but may have occurred outside that time window (though accelerated).
None of your other points, regrettable, discomforting and painful though they were, could have caused that surge in excess deaths.
I get that you hated the lockdowns. I’d argue most people did, but that doesn’t preclude the fact that many of the people that hated them also accepted their ‘necessity’. I put that in quotes because the necessity itself may be arguable, but the fact that many people were convinced they were necessary is not.