Presumably Sean Maffat was aware of the actual wording of the actual EASA recommendation (EASA SIB 2015-04, datd 27th March 2015) when writing his piece- here's the important bit:
operators are recommended to
implement procedures requiring at least two persons
authorised in accordance with CAT.GEN.MPA.135 to be in
the flight crew compartment at all times, or other equivalent
mitigating measures to address risks identified by the
operator’s revised assessment.
It's short paragraph worth a careful read.....