The foundation of the pitch is that the E.U. is set to be the...

The foundation of the pitch is that the E.U. is set to be the fastest growing battery market in the world, and they have essentially no domestic lithium supply. Aware of this problem, the E.U. founded the European Raw Material Alliance aiming to secure domestic sources of critical raw materials, including lithium.

Looking at the European continent, lithium resources are sparse. There are only two resources of major consequence: Cinovec (EMH's deposit - holding over 60% of Europe's hard-rock lithium) and the Rhine Valley geothermal brine resource (owned by Vulcan). As to why EMH over VUL, the main reason is because EMH has a proven extraction process that has passed through locked cycle testing and can be done at low cost. VUL hasn't even begun testing yet on a DLE (Direct Lithium Extraction) process for their brine, and there is no telling whether they will be successful or how long it will take to develop.

You should spend more time doing DD than reading posts on HC from people who own the stock and have their own biases though.