There could be so many reasons for the delay and nobody knows...

There could be so many reasons for the delay and nobody knows why it takes this long.
One of my own thoughts could be, that if the results were not positive at all (unlikely) we would most likely already know weeks ago.
This is one of my positive versions, mind you I also have negative ones going through my head.

Let's say they are positive and let's say all three show good results. Biotron would like to partner or sell to one entity, as one party, would not like BIT225 to be spread around and devalue their acquisition.
Think of it, HepC, HIV and Covid, if all successful, would require a very big player or group of players to be able to afford such achievement.
Before this can translate in a deal with Biotron, that party or parties may have asked for further detailed data a few times as we are dealing with three treatments, which would delay the final results.
Once announced, there should be no doubt on the full capability of our drug, triggering the correct responses from those who are interested.