All well and good, but where are the evidence to back up that claim?
LTK went ahead and mentioned the biasedness in front of an audience, so that every Singaporean can listen to his views. He isn't afraid that the MSM will retaliate or respond.
Further, if "PAP heavyweights" are giving negative feedback directly to the MSM but does not cast any such issues in the public light, it seems to imply that:
1) Some "heavyweights" have direct connections to the MSM
In fact, I was even more amused to see that Mr Baey Yam Keng has once again decided to jump into the fray and defend the MSM. At least the comments from Zaobao editor Goh Sin Teck are expected, as the MSM obviously have to issue statements that they are fair and not biased, etc. But the fact that the responses from so many MSM editors and even PAP members are given so much coverage, again speaks for itself. Perhaps some members of parliament have yet to grasp the concept of staying silent on an issue that doesn't directly involve them, rather than speaking up and saying the wrong words, and get "quoted out of context" yet again.