From the OP article:
The two workers were teenagers and died after being electrocuted while cleaning the kitchen during the overnight shift on Sunday, the national Peruvian newspaper La Republica reported.
I don't know how that kitchen was constructed/organized but the
M cooking areas I've seen use special IEC-309 power connectors: color-coded according to what is being powered; some degree of water-tightness (different IEC-309 connectors can be drip-proof, spray-proof, or, IIRC, immersible to some very moderate depth). I'm going to wildly guess that something in that kitchen was wired incorrectly.