Personally, I've maintained all along that that's exactly what it was. They knew going in that they'd get answers* from the older players that they didn't want to hear, and so they made sure not to hear them.
* - including tendencies toward longer and more stable campaigns, greater prevalence of kitbashing and rule/system tweaking, fewer purchases of anything other than adventure modules, slower levelling, larger parties and-or more players, etc.
That's still no reason to exclude their voices.
Imagine the squawks had it gone the other way, that responses from anyone under 35 were tossed.
Which while true is still no excuse for failing to make the snapshot-in-time as representative of the complete demographic as possible.