This is literally not true.
Most virologists say the way this virus works is unlike anything they’ve seen or expected so they can’t imagine how a human would have engineered it. Why do you think your feeling about the virus’s level of adaptation trumps the experts opinions?
1) Citation on "most" please. The world is a big place, so you will be able to find a citation for any opinion. If you are going to say "most" then please back it up with a source.
2) gain-of-function research doesn't require a human to engineer a new virus. It is a way to essentially speed up evolution and allow nature to do the heavy lifting. You're arguing points that no on here is making.