This is now fixed and updated at the official download site: http://mameload.mameworld.info/m1xmldownload.htm It was strange how BridgeM1 was able to audit this and not complain - which is why I missed it.
I would greatly appreciate that in the future that there would be no external sources for the M1.XML file I try hard to maintain with current MAME versions and having multiple unofficial 'fix' versions can be confusing and not desirable.