If his site qualifies as a public site in Israel, and the main content of the site is the videos, it would be required. Since his sites' purpose was almost entirely the videos, I think it would be hard for him to defend his case in court.

I don't know what happens to sites that are collecting links to videos that were not made by the site author, because clearly the author can't modify other people's videos and can't rehost them without violating copyright. But a human judge wouldn't be fooled by it in this case :)

Also note: the law requires captions, not Hebrew captions. The captions must match the spoken language in the video.