Any, all or none of which may or may not be true, but demonstrates that you have entirely missed the point of the quoted passage.All lockdowns do is buy time; if a vaccine is in development then in theory you could have very few deaths if you locked down as soon as the virus was known about, until all vulnerable people were vaccinated. A very harsh lockdown that was well observed would still have resulted in transmission as people would have still had to carry out certain essential tasks and some jobs clearly have to continue during a lockdown. But that would have been over a year; it would have been unaffordable and untenable.
The sort of people who call for lockdowns are either the type who have well proportioned homes, work from home jobs (or are retired etc), gardens, are able to visit the countryside, and are more interested in trying to stop other people doing things than anything else; they will still go out on a regular basis themselves, while urging others to 'stay home' or tend to be far-left authoritarians who are keen to fall into line with their far-left authoritarian comrades and allies.
People who use terms like "full lockdown" are probably indicating that they want other people to be further restricted, with more businesses closed, more debt, more jobs lost etc, but of course they would still have indulged in whatever activities they saw fit themselves.
Ferguson is known for his prediction of 510,000 deaths in a totally implausible scenario, and ridiculed for his pessimism - yet the suggestion here from a serious statistical commentator is that his estimate for the scenario that did arise was in fact too conservative. That made me sit up sharply when I read it - because it was so counter-intuitive.
I’ve yet to read the book it’s taken from; I’ve no idea of the policy biases of the author and I’m drawing no policy conclusions from it. But it reminded me, not for the first time, of how wrong the general view can be. I wouldn’t for a moment have considered Ferguson over-optimistic in his assessment of what was to happen last year - yet that is what was suggested there.