The quote you are trying to quote as anti Ahmadis quote is :
“And God chose such an ignominious place to hide/bury the Holy Prophet that is awfully stinking and dark and cramped and the place of excreta of insects…” (Ruhani Khaza’in, v. 17, p. 205)
Firstly this is a mistranslation and the word bury is not there. They try twisting what Ahmad(As) was saying to refer that he meant the burial place of Nabi(saw) when this is really talking about the cave of Thaur where Nabi(saw) hid with Hazrat Abu Bakr(ra) during his Hijra.
The full quotation is:
“I have written again and again that this great distinction that is given to Jesus, of going up to heaven alive, staying alive for so long, and then returning, is an insult to our Holy Prophet Muhammad from every aspect and it makes Jesus have such a close connection with God as has no limits. For example, the Holy Prophet Muhammad did not reach even the age of a hundred years but Jesus is alive even after almost two thousand years. And God chose such an ignominious place to hide the Holy Prophet that is awfully stinking and dark and cramped and the place of excreta of insects but He took Jesus to heaven which is the location of paradise and the vicinity of the residence of angels. Now tell us: to whom did God show more love, to whom did He accord more respect, to whom did He grant a place near to Himself, and to whom did He give the distinction of returning back?” (Tuhfa Golarwiya; Ruhani Khaza’in, v.17, p. 205)
The words are ” And God chose such an ignominious place to hide the Holy Prophet that is awfully stinking and dark and cramped and the place of excreta of insects but He took Jesus to heaven which is the location of paradise and the vicinity of the residence of angels” These words refer to the beliefs of the Muslim opponents and as an insult. Ahmad(As) did not insult Nabi(saw) ever rather said : O my opponents, you are insulting the Holy Prophet in this way! This is pure, sheer and blatant fraud committed by our critic or by the sources he is relying upon.
Ahmad(As) states in another book referring to the same opponents:
“…they consider that the negation of murder, denial of killing on the cross, and the word raf‘ prove only that Jesus, having escaped from the hands of the Jews, went to heaven with his physical body. As if, besides heaven, God the Most High could find no place on earth to conceal him. In order to protect our Holy Prophet Muhammad from the hands of the disbelievers, a terrifying cave full of snakes was enough. But enemies of the Messiah would not have left him anywhere on the earth, whatever plan God the Most High may have devised to save him here, so God having become helpless against the Jews — God forbid — was compelled to choose heaven for him!” (Kitab-ul-Bariyya; Ruhani Khaza’in, v. 13, p. 227, footnote)
It is clear what Ahmad(as) was referring to. Ahadith show us that Thaur was a scary spot. May Allah guide anti Ahmadis who still continue to lie about Ahmad(as)