Private screening counting as a release date

Hello all. Yesterday I came across the IMDB page for Holiguards Saga: The Portal of Force https://imdb.com/title/tt36149778 . It had a private screening in February at the ASTOR film lounge in Berlin (see https://www.morningstar.com/news/accesswire/1138541msn/berlin-hosts-private-premiere-of-holiguards-saga-with-kevin-spacey-and-elvira-paterson ) and that was recently added as a release date. It was my understanding that private screenings do not count as release dates on IMDB, similar to Cinemacon screenings. I tried to submit a deletion but it was declined (#260326-002157-474000 ) so I thought I'd ask here if these rules applied to this release date as well. Many thanks.