There is nothing wrong with 2 datums, the issue is that during machining this is not "a part" but an assembly that moves.
There are so many failings from my POV in the manufacturing process and verification of the part, which is summarized nicely by the following quote:
. Furthermore, initial inspections at the start of the production run were supposed to verify that the manufacturing process was creating products that satisfied the “design intent,” but the initial products were checked against the manufacturing drawings, not the design drawings.
. Furthermore, initial inspections at the start of the production run were supposed to verify that the manufacturing process was creating products that satisfied the “design intent,” but the initial products were checked against the manufacturing drawings, not the design drawings.