Lots of factors missing in that valuation. It looks like some high school homework.
For starters, strategic factors mentions geopolitical an regulatory risk in the DRC (downside), but not the incentive for the USA to ensure strategic control over the resource (upside).
That includes locking in access to Lithium for use by their Industries, and also ensuring China can't further monopolise and manipulate Li price.
The possible value of the Tin and Tantalum aren't included in the simplistic valuation.
No mention of how operating margin is calculated or compared to other resources. We can shovel this stuff off the surface at Manono.
Also nothing about Saudis looking for investment into a longer term easily accessed energy based replacement for oil.
I don't think they've priced in the strategic value of the asset at all, and overstated the geopolitical risk given that the interested parties can exert a lot more influence than AVZ can. Especially given our impotent and disinterested Government.