I do not agree
Then tell us why it is physically impossible on FE and stop trying to change the subject away from that or ask others to prove the shape of the earth. Sounds like someone who can't defend their position that the earth needs to be round for this to work.
If you are going to selectively quote me, please at least use full sentences and not just fragments without context. Thanks.
I do not agree with your conclusion because you have not provided any evidence that the LIGO engineers and scientists were wrong, or made any mistakes in their construction due to any errors. They have claimed they needed to compensate for the curvature of the Earth, and I simply ask how you determined they are wrong. The facility is well documented.
I have asked for you to provide the evidence you used to conclude they made an error, and you have not done so or indicated any mistake on their part. The facility indeed seems to function, and the tunnels and tubes are straight as they sit on a foundation that is curved, not just angled at one end.