Fictitious "dark matter" should not be detectable as Standard Model point particles because the extra gravity actually comes from outside our Big Bang, according to my BBN (Big Bang Neighbor) Hypothesis. Fictitious dark matter should instead appear as a smeared out blob, just like the posited axions in the paper of Alfred Amruth et al (Nature; 20 April 2023). I, however, don't have to invent a new particle to explain anything.
https://skyandtelescope.org/astronomy-news/distorted-galaxy-hints-at-the-nature-of-dark-matter/