I have always found [union closed conjecture][1] very interesting. There is an [arxiv article][2] claiming the solve the problem. My background is not appropriate to read the proof. Is this proof verified or wrong? Any comment would be appreciated. 

The article was submitted in 2015 and it is not too long(about ten pages). Thus, I expect that it should be verified until now.


  [1]: https://en.wikipedia.org/wiki/Union-closed_sets_conjecture
  [2]: https://arxiv.org/pdf/1507.01270.pdf