First of all, credit to the reporter for producing a balanced report that is somewhat critical of the Biden administration.
All of these predictions about returning to normalcy are based upon when the person giving the prediction deems it acceptable to get back to normal. Even if it takes through August to vaccinate everybody who wishes to be vaccinated, how is there justification for not getting back to normal until 2022? Even if the vaccines don't slow transmission (which they likely do to some extent), they do appear to be extremely effective in preventing severe illness and death.
Of course there will always be some people who are vaccinated and end up getting a severe illness and very likely some very small percentage will die from it. However, once we've reached the point where everybody who wants to be vaccinated has been, there is absolutely no reason to do anything to try and protect the people who have elected not to be.
As long as the vaccines continue to prevent severe illness and death at a very high level of effectiveness (currently seeming like 99% or better by that metric), we should return to normal the day after the two week period has passed from the second shot of the last person who wants to be vaccinated.
I feel this way even if the vaccine isn't approved for 16 and under. The case fatality rate for 16 and under is less than .004% and the infection fatality rate is likely a lot lower than that. There are many things that people 16 and under are at higher risk of serious consequences or death than COVID.