Classic points are based on the rankings used for all available charts. 10 points for being #1, 9 points #2, etc. Better rankings, more points. More countries, more points.
Adjusted points are corrected for better comparison because the number of measured countries is changing over time. Older titles have less classic points because fewer countries were obtained, therefore, points for newer titles are adjusted & lowered.
All points are based on Netflix TOP 10 official feature, but the points are not official numbers provided by Netflix. For official viewers numbers see this table with the most-watched titles in the first 4 weeks after release.