I think that was the total number of accused, they didn't accuse all of them for going into Gaza. We haven't seen any evidence yet.

Looks like they're only showing it to Sky News which has to make up for its reporter getting a little too factual

Wasn’t it 12 like a day or two ago?

That's my understanding.

In an ap article of the 29th they say:

DETAILED ALLEGATIONS AGAINST UNRWA WORKERS
The Israeli document, which has been shared with U.S. officials and was obtained by The Associated Press, lists 12 people, their alleged roles in the attack, job descriptions and photos. The findings detailed in the document could not be independently confirmed.
The document said intelligence gathered showed that at least 190 UNRWA workers were Hamas or Islamic Jihad operatives, without providing evidence.
It said of the 12 workers, nine were teachers and one a social worker. Seven of the employees were accused of crossing into Israel on Oct. 7. Of those, one was accused of taking part in a kidnapping, another of helping to take away a dead soldier and three others of participating in the attacks. (...)

The numbers mentioned in the posted article I first saw them on a wsg piece co-written by Carrie Keller-Lynn, a former political and legal correspondent for The Times of Israel which has some ties with the IDF, to be more precise the IDF spokesperson unit. (Relevant link from twitter).

[edit: I tried looking for her linkedin profile for more details, which appears in the results as: Carrie Keller-Lynn - The Wall Street Journal | LinkedIn but I get Profile Not Found - An exact match for caroline-keller-lynn could not be found. for now at least.
edit2: I removed a link]