I don't think they killed off the modrons from anything that was said. Is it clear that we're not likely to get any more material on them with the current crop of designers? Probably yes. Is it clear that at least one person there simply doesn't like them? That's clear from the chat I think.
Suffice to say, I don't buy the reasons, nor the anecdotes, given for the lack of Modrons in 3e. Far as I'm concerned they're still in Mechanus squashing twisted refugee ants from Arcadia that are inexplicably expansionist. And they're still marching every hundred cycles just to be a thorn in PCs side when his players ignore them.