Are they reasoning that Jehovah is no longer judging them on the amount of hours that they witness but is still doing so when it comes to pioneers and others?
In another part they talk about giving your best which has no connection with giving 10%.
They also talk about the pioneers being like the Nazarene's because they made a vow to commit (to certain requirements, as in hours). Later they mention something no longer being applicable because there is no type/antitype. But the organisation still sees counting time as an important part for them and that monitoring time is still a requirement even though they just said that Jehovah doesn't require it and that it's not an important part.
They've created a new class of JW, one that doesn't need monitoring and one that does.