“that would be antigravity and no one can prove it didn’t happen”
Except according to relativity, it doesn’t actually matter if you choose to view it that way, the results will still be the same.
Then wouldn’t Relativity tacitly support the notion of contra-gravity where the large mass is perceived to be moving towards the smaller mass? I would expect gravity not to be a quality/dimension of Relativity, but this topic is many decades old in my distant memory. All I recall is man walking inside a train that’s passing a platform — or something like that.