It seems the screenshot was doctored or The Guardian have edited it. here is the article.
The hostages to be freed are women and children, and the Palestinian prisoners are also women and children, both sides have confirmed.
Also further up in the article is the following
The exchange of female and child hostages and prisoners was due to take place on Thursday but was postponed as last-minute logistical issues were worked out during 24 hours of frantic diplomacy.
It seems the screenshot was doctored or The Guardian have edited it. here is the article.
Also further up in the article is the following
source
The Guardian edited after the fact. An archive link has been posted elsewhere in this thread