The NTSB believes pilots should be knowledgeable about the effects of a tailwind on the landing performance ...
Well done to the NTSB for stating the obvious.... Although I do accept that this statement was most likely a small part of the whole.
In honesty I find it remarkable that the NTSB find themselves in the position of 'having' to make such a statement.
Even if a considerably experienced (in total hours) Captain had been given no specific training on the effects of a tailwind on landing performance, he must have had exposure to the effects during his career and so would surely have picked up some sort of understanding.
As for the very deep touch down - well we can all experience a 'float' from time to time (in my case it has almost always been a result of a poor handling technique in the flare) - but the option to go-around must be exercised if landing performance may be in doubt.
What were this crew thinking?