Guess it comes down to definition. I didn’t see much definition in the citations above.
And similarly, you probably get just as much
lack of definition from some in the media and the general population when they discuss or refer to it and bandy the term about willy-nilly.
Like Pappy used to say:
"All they really know about it is they are agin' it ... and don't like it much either !!!"

Basically, it ("lockdown") involves a whole range of
non-pharmaceutical interventions which are intended to limit the spread of the disease and can range from mild measures such as mask mandates and maintaining distance to more extreme measures such as requiring people whose jobs are not considered essential/critical to the functioning of society to stay home and non-essential businesses to temporarily close.
Quarantine (self-isolation) if you know you've been exposed, etc. The whole list of interventions is too large to easily list here.
A number of specific things from this range of measures was discussed and/or mentioned in a number of the citations I previously linked.
My guess is true lock down, meaning absolutely no contract with another human being outside your household doesn’t happen but extremely rarely.
Yes.
Has there been contact that involved social distancing, masking, hygiene, I suspect so. If you had contact without social distance then you weren’t locked down.
David, I believe I understand your meaning here ... and if so, I would agree ...
May have missed somebody, but I can’t recall anybody on this site or anybody I know personally that observed true, absolutely no contact lock down, but I sure know significant number of people that have limited contact while practicing safe distancing, masking, hygiene.
Largely the same here - but using your definition (as per the above) that's being "locked down". (Assuming I understood you correctly)
But as RNG observed, it's the people who refuse to act responsibly who are the problem children.
Just my opinion of course. I am very glad that those I am likely to encounter have been vaccinated and still follow safe practices.
I can't say that everyone I'm likely to encounter is vaccinated or follows safe practices ... simply because if one goes out and about into the general public it's hard to know who you'll encounter.
But it's a safe bet that if they aren't following safe practices, I'll be headed in the opposite direction in fairly short order.