NASA has kinda lost its credibility by lying - the issue has only snowballed over the past few decades, and now a large section of the population don't believe them. Isn't the invention of a new organisation using the same methodology of lying the easiest and most obvious alternative for them? Afterall, they had all that taxpayer money, and all they ever produced was a few rockets that went nowhere, and a handful of obviously fraudulent videos. How simple to create, purchase or otherwise hire other organisations that many folk won't associate with the first?
Your reference to Eratosthenes allegedly "proving" the Earth is flat has been addressed many times before, but I post below for the convenience of the casual reader. In short, you cannot prove something by relying on the assumption that it is true.
https://christianchat.com/conspirac...ured-and-if-so-how.211763/page-2#post-5114490
"The problem with this (as a proof of ball-Earth) [i.e. Eratosthenes' "proof"] is that the result is similar whether Earth is a sphere or flat. Flat Earthers simply respond that of course the angle of the sun is different at different places, because of trigonometry. To demonstrate this, simply place two upright blocks on a table about 1 meter apart and hold a torch overhead the first upright block. The shadow created by the first block will be almost non-existant [sic], dependent on how well the torch is held overhead, whilst the shadow created by the second block will be more pronounced. This doesn't mean the table is curved - it means trignometry [sic] results in different shadows dependent on the position of the blocks and the torch.
(It may have been that Eratosthenes assumed a large sun and a large distance between it and Earth for his "proof". However, these are Heliocentric assumptions, and it's circular reasoning to claim to prove a theory with the very theory one is trying to prove. Flat Earthers typically believe the sun is much smaller and closer than Heliocentrists. This is consistent with observation, which shows the sun's rays approach Earth at different angles, rather than all at the same angle as would be consistent with an [almost] infinitely large sun at an [almost] infinite distance)."