Wide Lens (held) doesn't work

[diabolith]

00:24 You see a Wide Lens. Pokemon held item. User has a 5% chance to deal fatal damage. User blocks enemy fatal damage. Can only be used by Pokemon with Protection or Healing moves, including TMs.

This held active but don't give fatal damage.

 

[Modem]

It's not "Lethal damage" as in executing the target, it just does 70% more damage