Interesting, because the flat earthers tried that very experiment with the laser in the documentary and it failed...🤔
For example, in the video experiment I linked, if the laser could not be seen at 40km, this might mean the experiment had failed (i.e. an inconclusive result). But if, along the way, the scientists observed the laser light only being visible at higher and higher altitudes (consistent with the Earth's alleged rotundity), this would likely be evidence that the Flat Earth hypothesis was wrong, and that Earth was indeed a ball. Note that at 40km, this would be some 30 or more meters in height (actually more than 100 meters if laser was level).
Also, remember the [DS] (whether Free Masons, or CIA, or Communists - essentially the devil's minions on Earth) will always try to obfuscate the truth. Look at the Maricopa audit. Apparently, a draft audit has been released showing Biden had even more votes than counted. Look at Ivermectin. If one believed the [DS], one might think it was only a medicine for horses. The whole Creation/Evolution debate - [DS] says Creation is religion, but Evolutionism is science?