They only withdrew it after someone pointed out that it was a flawed paper.
In one case by asking Astra to review it.
Not exactly encouraging that they did their homework before publishing results.
In one case by asking Astra to review it.
Not exactly encouraging that they did their homework before publishing results.
Peer review is then done _in private_ before publication as a check on quality and significance.
Retracting a paper is pretty embarrassing. And not considered science as usual.
Besides which it's not clear if these papers are considered published or preprint since they appear in no journal, so it's not really a retraction.
It's also very very normal to post preprints on Arxiv before peer review, so it's not the case that mathematics is kept private during review.
I don't know why people are talking about something like this that they are clearly not familiar with.