[einpoklum]

> it sounds more like a procedural oversight.

But the "oversight" is likely due to the fact that those policy-makers only see MS Excel used around them, and only expect people to use MS-Excel - which is why they did not think there might be any problem with requiring its use in a procedure. So, the people doing policymaking, and other related technical work, at the EU do actually need their MS license to work.