Your point I en II could have been true if the charts were based on streaming or YouTube views.
But they're not. They are based on vinyl single sales. I don't think anybody would buy a vinyl single out of sheer curiosity or morbid interest.
Point III seems valid. I think lots of Beatles fans buy it just because it's The Beatles. But it's still a lot of products sold...
"With 19,400 vinyl copies sold, it’s the fastest selling vinyl single of the century, and its total physical sales of 38,000 were the biggest single week of physical sales since 2014, when X Factor winner Ben Haenow reached Christmas No 1 with Something I Need."
and
"Now and Then was also streamed more than 5 million times in the UK, by far the highest single week figure for any Beatles song."
Having said that, they outnumber sales of The Rolling Stones latest effort. Wouldn't the Stones benefit the same mechanisms more or less?