If Jehovah's organization knowingly endorsed false teachings, advice to read the Bible would never be given to Jehovah's Witnesses and those to whom they preach
As ever, rather clever double-speak going on here.
Clearly, the WTS has endorsed 'false teachings', often for many decades before they adjust them, but of course they are not 'false' if God allows them to teach these doctrines. This is called refining.
Often the GB are fully aware that certain teachings are 'false', but continue endorsing them until it is 'due season' for them to be changed. This is normally when they can be introduced with the minimum amount of negative fallout both outside its Organization and within the congregations.
What this makes them is trickier than a used car salesman with an alimony payment to meet.