The same logic you're using to justify Hyder's action here would also condone anti-abortion activists hijacking meeting after meeting to voice support their cause. But that's obviously an untenable situation. So, what then? Do you want the city council engage in selective application of procedural rules, and let Hyder and other anti-Flock activists take up time while anti-abortion activists are denied that opportunity? That would be an actual speech issue: time, place, and manner restrictions on speech are permissible but they cannot be selectively applied.