Daptomycin, mentioned in that second link, is an IV abx. Dapsone is the oral version. My understanding is that Horowitz has been treating lyme patients with oral Dapsone for a couple of years, in combination with high dose folic acid (the study says folic acid was used for the purpose of mitigating the small risk of potentially very dangerous side effects of Dapsone, but on his FB page he says it was, indeed, methylfolate, i.e. natural folate rather than synthetic folic acid). He has a paper on it. https://www.omicsonline.org/open-access/the-use-of-dapsone-as-a-novel-persister-drug-in-the-treatment-of-chroniclyme-diseasepost-treatment-lyme-disease-syndrome-2155-9554-1000345.php?aid=7159
From the anecdotes I've read, like anything else, it helps some and not others. Personally, I'm very interested in the anti-inflammatory and immune modulatory effects of Dapsone in addition to its antibiotic qualities.
For a lyme angle, there is an interesting discussion here http://flash.lymenet.org/ubb/ultimatebb.php/topic/1/136190