Yeah, seems to be the case.

https://news.sky.com/story/dam-colla...-dead-11446938

The portion of the dam that collapsed on Monday is reported to be a "saddle dam", an auxiliary structure used to hold water beyond what is held by the main dam.

The $1.2bn (£915m) dam is part of a project by Xe-Pian-Xe Namnoy Power Company, a joint venture which is also known as PNPC.
A number of companies are involved, including Thailand's Ratchaburi Electricity Generating Holding, South Korea's Korea Western Power and the state-run Lao Holding State Enterprise.
The 410 megawatt capacity dam, close to the border with Cambodia, was meant to begin commercial operations by 2019.


It was to form part of a series of dams over the Houay Makchanh, the Xe-Namnoy and the Xe-Pian rivers in neighbouring Champasack province.


The plan was to export 90% of the electricity generated to Thailand, with the rest offered up on the local grid.


Environmental groups have long voiced fears about hydropower ambitions in impoverished and landlocked Laos, with around 10 dams in operation, another 10 to 20 under construction and dozens more in the planning stages.


In particular, concerns have been raised about the impact on the Mekong River, its flora and fauna and the communities that depend on it for their livelihoods.


As well as disquiet within Laos, several neighbouring nations are worried its ambition to become the "battery of southeast Asia" will disrupt vital ecosystems and their own river systems.