[mr_mitm]

How is it not clear? GR reduces to Newtonian gravity in the weak field limit, which MOND is explicely not. If MOND is true, then GR is wrong.

[throwawaymaths]

Have some nuance. GR is already known to be "wrong" since it isn't reconcilable with QM.

If any given MOND is true, GR needs some (possibly minor) changes in the limit, just as GR needs (possibly minor) changes to accommodate QM