I'm not parent commenter, but TFA is primary reporting containing exactly the evidence you are asking about.

men [...] held under Israel's Unlawful Combatants Law, a measure by which people suspected of posing a security risk can be detained for an unspecified period without charge, as Israel set out to recover the hostages and dismantle the proscribed terror group

which may or may not be distinct what parent comment refers to by Palestinian prisoners:

https://www.bbc.com/news/articles/cn7vje365rno

The BBC article cites further related reporting:

https://www.bbc.com/news/articles/cx2yylgze4ro

https://www.ohchr.org/sites/default/files/documents/hrbodies...

have you got any evidence to the contrary?