Ann: Commencement of Bulk Sampling at Equador Niobium Project, page-43

It will matter when you consider processing it and the viability of the project! I recommend you to research this before you post silly comments.
When the majority of your rock is formed by Cerium (a type of REE), it means that there's more garbage within your rock than there is useful elements. When you try leaching it, you have to use a higher pH acid, because it's more difficult to process and get rid of the garbage. When you use a higher pH acid, it'll cost more (therefore it is not good for the project economics), but also reduce your recovery %, not to mention the environmental impact.
Looking at those numbers, they suggests that more than half of the total PREO across the samples are Cerium which has no value and not ideal due to the above. I guess we'll know when they do their met results.
IMO DYOR