Youtube mass flaggings

I had 30 video's on YT all the videos are uploaded from the same IP.
15 videos link to a domain name1 and the other 15 to another domain name2 but they are the same video.

Yesterday 15 video's got deleted that were linked to domain name1, all of name2 video's are still intact.

So clearly it is my domain name1 that flaggers use to find my video's.

My options are
1. Url shortener, but that seems untrustworthy for visitors (less CTR)
2. Put my url in the comments

If i put my url in the comments lets say www.123test.com, will someone be able to find the video if they search for 123test.com on youtube?

No they cannot find the url in the comments.

I am extremely confident they could find the urls in your comments. Additionally, if their flagging system is tight - they may have already bookmarked all your hot keywords, and blanketed your niche.

It's much more efficient if you actually put 1 video per account with a subdomain and that would ensure the system won't link them all directly.

You can also link a random .tk or other free domain tool through url redirection.