The idea of community elected seats is just that; the electors are members
of the community. So if we decide that employees of community
organizations, like the WMF, are part of the Wikimedia community... then
they should have the right to vote on community seats of the Board of
Trustees. Whether any individual member of the community has a second
opportunity to influence the composition of the board is irrelevant to
determining whether they should have suffrage as a member of the global
community.
Not to put too fine a point on it, but there are many people eligible to
vote in the election that also have chapter affiliations which give them a
voice in the chapter-appointed seats. Since we don't disenfranchise them
for their "double vote" power, we should not disenfranchise other people
that meet our working definition of who counts as a member of the
community. Either staff employed on behalf of the movement count
everywhere, or they don't count at all; there is no reason I can see that
employees of the WMF are more entitled to vote than, say, employees of
WMDE.