Just looking at those results, I'm sure others have noticed how...

Just looking at those results, I'm sure others have noticed how many fell at exactly the same numbers, like 129.18 ppm Li2O. or 107.65 ppm, or 86.12 ppm...

Hmm .... at 2.153 conversion from Li to Li2O...
150.71 ppm Li2O = 80 ppm Li
129.18 ppm Li2O = 70 ppm Li
107.65 ppm Li2O = 60 ppm Li
86.12 ppm   Li2O = 50 ppm Li

According to this source ....
https://pubs.acs.org/doi/10.1021/acs.est.3c01431

....background levels of lithium in the Earth's crust are 20 - 60 ppm, so calling 6 samples at 70 ppm lithium and 1 at 80 ppm Lithium as 'anomalous' is gilding the lily to say the least. Other sources claim 1 -200 ppm lithium in soils as 'background levels. Likewise for the other elements, calling 6 ppm Sn, or 9 ppm Ta or 15 ppm Nb as anomalous is ridiculous.

Given nothing of any importance from 550 samples, which is surprising by itself*, this area is screaming, move on to something else...

* If you take a lot of soil samples, there are usually one or 2 surprisingly high readings of one thing or another, just from random chance. It's surprising to me that they found nothing outstanding of anything.