If correct, the comments do say a lot even if in bad English. Somebody claimed to be a swimmer and then went free diving without notifying anybody and without having a buddy. Sad outcome. But not surprising especially if they were untrained.
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So, what's a dive park to do? Require everyone that comes to swim have a Freediving cert? Tell swimmers they are not allowed to hold their breath when they are in the water? Tell swimmers they are not allowed to duck below the surface at all (unless they have a freediving cert)?
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Exactly this. Allow no underwater breath hold diving without a certification and a buddy. A quarry with limited visibility is not the place to solo free dive.
and there is no right to be stupid in public
Assuming that they implemented a way to differentiate how they signed in (wrist-bands?) then Swimmer = no Mask/Fins/Snorkel/Wetsuit will keep most from freediving I suspect. Show up at the beach rocking freediver (or scuba) gear without the right wristband and you get sent home.