Very true CEO, Lynas only produces product specific to customer...

Very true CEO, Lynas only produces product specific to customer requirements (not to spot market). This ties the customer to Lynas and from the customer pov ensures minimal/no process modifications or reprocessing of input product to fit their own process which they usually have to do for other RE product. This is Lynas' value proposition, for which they will ask a premium....simple, but impossible to duplicate.
To this extent, Lynas (not fanciful) can actually see themselves as a "price maker" for their product.
Also, people should not forget that optimising production around the 11kt level (for now) is not only about market demand, it is also optimising at the lowest cost of production for the price and desired quantity of goods sold. Put another way, this does not mean that there is no market above 11kt for them, just that the tonnages sold above this imo do not fit their earnings profile requirement at current prices at this point in time.
Lynas are very carefully managing output volume, costs and prices to suit their financial business plan imo. As always, do your own thing.
regards primaj