firstly.. the 12 conditions would not be to appease an objector. It is very common for planning to be granted subject to conditions.
secondly, any person is within their democratic right to object and appeal a planning application. yes it delays the process, but it is something that should be considered from the outset....
thirdly, he can say whatever he wants in this appeal... its up to him to PROVE what he says...
forthly, you get an oppurtunity to answer his appeal, and in this answer its up to you to DISPROVE what he says....