I'm glad your husband got off dialysis, but your story in no way can give "everybody" hope. In fact, I'd bet that it won't give even 10% of us any hope.
My dear, with diseases of any kind, this sort of thing can happen. And, it is marvelous. Keep your hopes up and who knows, " the good things" can happen to him and you. My dear husband was diagnosed with lung cancer, with a massive, chest tumor, in operable. The Dr. admitted him to the hospital so he could pass there and lo and behold, his tumor was completely gone. With no medications and no help, in less that six weeks. So dont let people get you down, stay happy and enjoy each other.
If he hasn't already, I and others on this site would advise your husband to adopt a vegetarian diet. Animal proteins are rough on the kidneys, so to avoid a relapse he should get used to tofu and textured vegetable protein, both of which are tasty enough to satisfy all but the pickiest eaters. A consultation with a renal dietitian could help. He should also have the prostrate taken care of. TURP is a painless procedure that will relieve the pressure on the bladder and the kidneys. I would also advise him to consider taking curcumin and grape seed extract. As I recently noted on another post, there have been several studies that indicate the benefits of taking these supplements. https://onlinelibrary.wiley.com/doi/full/10.1111/bcpt.12817https://www.ncbi.nlm.nih.gov/pubmed/25474287https://www.ncbi.nlm.nih.gov/pubmed/27822171https://pdfs.semanticscholar.org/f376/3d1b97d5ace4820839039418014824640088.pdfFinally, my experience with kidney disease has been almost identical to your husband's, although I was never on dialysis. Like him, I was diagnosed with CKD as a result of high blood pressure and an enlarged prostrate. When my GFR dropped to 16, I was told to prepare for dialysis. Then, inexplicably, the GFR began to rise. It is now at 32, and the disease seems to be in remission if not complete reversal. My guess is that the kidneys suffered a prolonged injury that was neither chronic nor acute. In this intermediate state, which had a duration of two years, the nephrons were damaged, I believe, but thankfully not destroyed. My nephrologist and others will insist that it must be either/or, but I know that isn't true. Sometimes I think that I read more papers on PubMed than any of my doctors.