Yup, I read that and I don't see how it would be in the conflict of interest for probably the vast majority of cases. But, yeah, I'm not a lawyer too.
Edit: DPO Network says this which I think is a pretty good summary (though it's not part of the explicit legal policy, it's someone's opinion)
> CAN WE ASSIGN ONE OF OUR EMPLOYEES AS OUR DPO?
> Yes. However, you must ensure that other professional duties of this employee must be compatible with his/her new duties as DPO and do not result in a conflict of interests.
https://www.dponetwork.eu/faqs.html