What did he orbit?
Please read:
In 108 minutes, he circled the Earth, passing over the Pacific Ocean, the Straits of Magellan, the Atlantic and Africa before Voystok 1 reentered the Earth's atmosphere and landed near Engels, Russia.
I don't think so.
Why not? I've not quoted anything that denies a FE... is it not possible that he could have gone high enough to get caught in the current of Universal Acceleration and orbited around the disk of the earth if his altitude was sufficiently high enough in a circular path above the flat surface?
Besides. Horatio only asked for Empirical Evidence, and I've provided it. It is up to you whether or not you choose to examine that evidence and determine its worth to you.