So for the first point about 'moral relativism is true' yes it's a meta-ethical statement, but at the same time, logically, you're affirming the set 'moral relativism'.
And the second point, I would argue that 'universal moral values' arise from 'absolute moral values', whatever that might be, if it's even possible to know it.
I also don't think that moral relativism is a logical negation of moral absolutism, more like an opposing view.