Let me guess, LFTR have already done right? Wrong. It was a experimental reactor that did *no* breading. That did *no* in situ reprocessing. That didn't solve the corrosion issues, just suggested some things and on top of all that is still no fully decommissions. It was also tiny. At only 10MW.
As for TWR, well those estimates are from the company who wants to make them.
Read more serious articles and a little less LFTR fanboy sites and you would be a lot more informed.