That was my first thought but I doubt it's possible with a lake that's an average of 2m deep. I'd still suspect some sort of gas release though, from pictures it looks like it's surrounded on all sides so CO2 releases couldn't escape.
And the lake is in the very deep depression. If there was a release of something much heavier than air, it will congest there, and traumas can be post mortem
The low air pressure of the high altitude could also play a role.
Doesn't seem like that would explain the trauma
I'd not heard of limnic eruptions until now. They seem interesting and terrifying.
I was hoping the article would touch on that possibility.