Like all tests, one has to read the method and understand what the rating does.
More varnish is bad. But a scale assigned to clean vice varnishy can be anything. 1-10, 100-0, A-F, etc.
That statement applies ONLY to that test and in that context.
No good everyday application as far as I can see. I certainly can't get that info from a store shelf.
Although, I have extracted some decent info from manufacturers by asking to speak to the right people and talking backgrounds a little first. But not an everyday thing, and not always successful.