"does not understand the organisation and what it's about"
This doesn't ring true on the face of it, and it looks to me like code for a personality clash, as John Adams has suggested.
I have heard a strong hint from within that the decision may not be unanimous across the board. I don't know any more, so don't ask.

I notice that Nick Hallam's name doesn't appear on the list of board members on the EFDSS web site, but is still listed under "staff" and as a contact address on various pages.