You're right. The PAP certainly had not been silent on these issues. They had been saying quite alot in the media. Unfortunately there are absolutely no substance in what they had said. Whatever that came out of their mouths do not add anything new or show up any developments in these issues. It's just saying the same things over and over again but in different ways.
So saying alot can well mean not saying anything at all. Kingrant is indeed discerning of this and rightly branded the PAP as the government of silence.