So they went from saying that money that went into boxes marked "Worldwide Work" should go to mother, and money that went into local boxes stayed local, to demanding that ALL boxes be marked "Worldwide Work"!
I think it depends how many steps back you go.
The letter in March 2017 appears to follow the same principle as the most recent October 2017 letter, with the exception of the temporary labelling of the Local box (to local congregation) to become a Worldwide box (sent to WT Bethel)
Was there previous direction regarding contributions during WT broadcast events at KHs?