It isn’t as strange a statement as you make it out to be. There is a similar loss in technology for the 16” steel that was used on the WWII Battleships. Steel mills today cannot make it. The art and technique was ‘lost’ and would have to be remade with experimentation from scratch.
I think what the poster was saying is that, while we may have the ability to do it again eventually, we do not currently have the capability to do it TODAY.
NASA is saying that there is a “force field” or glass ceiling or glass bowl or something that is preventing them from getting out...
Probably a response to the huge amount of people who are questioning everything about NASA in the last couple of years; people now can examine NASA footage on their laptops at their leisure.