While other more knowledgeable folks than I have pointed out some very important things about your highly-declarative statement about dark matter, I'll raise one minor point about this research finding, which you can glean by reading the abstract of the actual paper [0].

The galaxy in question, AGC 114905, is described as lacking dark matter _because_ its rotational characteristics are readily explained by its baryonic matter content alone. MOND, therefore (and your entire argument), does not apply. You may have mistaken this for a regular galaxy with "missing" matter that also happens to lack dark matter, which would then suggest the need for an alternate explanation.

EDIT: The abstract also says, among other things: "We also find that the rotation curve of AGC 114905 deviates strongly from the predictions of Modified Newtonian dynamics."

[0]: https://academic.oup.com/mnras/advance-article/doi/10.1093/m...