I can confirm this for MyGeneration 184.108.40.206, as well. If an FK's Delete Rule is set to NO ACTION, or CASCADE, then MyMeta accurately reports that. If an FK's Delete Rule is set to SET NULL, or SET DEFAULT, then MyMeta reports NO ACTION.
BTW, if it is any reassurance, EntitySpaces does not use MyMeta's reported FK rules, it just lets the database do its thing. So, while MyMeta may be inaccurate, it should have no bearing on saving in EntitySpaces. The rules set in the database will prevail.
David Neal Parsons