Sure! Here is an article from Flight Global, which includes an interview with Song Xue, deputy chief of staff of the Chinese navy at that time.
China plans to build an aircraft carrier that is larger and can carry more aircraft than its current such warship, the Liaoning ...
www.flightglobal.com
And here is an article from SCMP about the refit :
Photos show warship undergoing revamp with scaffolding around ‘island’
www.scmp.com
True! It was a test but it proves landing capability in night. It tested particular scenario. BTW, this video is from 2018. So its already 4 years.
Lastly, I do not even know what do you mean by "Your video does not prove that this is an extreme test of performance". The video showed landing at night in pitch dark. If you think "normal operation" means Deck Lights, so it is simply beyond normal --unless I am missing something.