Moin mondy,there is an important restriction on obtaining an...

Moin mondy,

there is an important restriction on obtaining an export licence in Argentina. The background to this is the desire to incentivise investment in value-added production in order to prevent the simple exploitation of raw materials by foreign companies without domestic value creation.Although lithium chloride is not an unprocessed raw material, unlike lithium carbonates, the previous Argentinian government tended to categorise it as an "unprocessed" raw material / "resource". Obtaining an export licence for the exclusive production of lithium chloride was therefore not promising.

To my mind, this is a narrow-minded view of the loss of value, but it is/was the case. Livent, for example, produces both chlorides and carbonates. An important difference to pure chloride production and therefore has a comprehensive export licence.
I think that answers your leading question:
...why for the last two years has there been a steady stream of takeover offers/executions of undeveloped projects (some only at PEA stage)...

I am not aware of even one of these projects being based on a pure lithium chloride strategy?