Because Joseph Smith’s first vision is probably the best documented visitation of God in history, most members of the church have not done the in-depth study of this event to be aware of all the details. This is partly because there is not enough room in the general curriculum of the church to include all the scholarly research that is available.
Critics of the church like to pick such topics and present little known facts in a way that makes this new information look suspicious, suggesting that the only reason a particular fact has not been openly taught is that the Church is hiding it to avoid embarrassment. The critic will often jump to conclusions of fraud or deception using the argument that if evidence of a claim cannot be proven, it must not exist, which they say proves it is a lie.
Such accusations are very easy to make, but take more effort to refute. These videos are the result of such efforts on the rich subject of Joseph Smith’s first vision.
For more information see https://www.lds.org/topics/first-vision-accounts?lang=eng