I think this issue requires some clarification. Is the person a licensed MFT AND a licensed psychologist? If so, providing psychological testing and services as a licensed psychologist is not unethical. However, if this person is a MFT who pursued a non-psychology PhD and are providing psychological services, that's unethical. Or, if they aren't licensed on the PhD level at all, and are providing services under the MFT license would be unethical because an MFT license doesn't enable you to do psychological testing. But these are separate issues. Can whoever posted the original message provide more information about these allegations?
I am a licensed MFT who worked for a couple years before pursuing a doctorate in psychology (hence the sign-in name). One of the reasons I sought the doctorate was in order to learn how to conduct psychological testing, which I was not able to do with an MFT. So this issue is of particular salience to me. My hope is that this person is providing psychological services under a psychology PhD and isn't misleading the public in any way. The general public doesn't understand the distinctions between the different mental health fields and are quite vulnerable because of it.