How does it give them any useful information?

"Our customers are concerned about the slow pace of development and our apparent emphasis on non-development tasks" is useful information.

The questions about what is being worked on and the part about asking them to work on the game itself is really just a passive aggressive complaint about development speed.

And what you just said is called "tone policing" and it's bullshit, so we'll say no more about it.

Telling someone to just do something better or faster is not terribly useful.

It is when you're the customer. That's valuable customer feedback. If Squad doesn't want to hear it, that's a problem for Squad.

To give constructive feedback

You seem pretty consistently to be misusing the word "constructive" here. The customer is under no obligation whatsoever to be "constructive" when giving his honest feedback to a company. It's the company's problem to take customer feedback and turn it into an evolution of their business strategy. The customer isn't getting paid; it's not up to the customer to come up with ideas and present them diplomatically.

We have no idea of the development bottleneck is with textures, 3d models, physics engine or game logic.

Yes we do. We get self-reports every week. We know exactly where the bottlenecks are because Squad has told us. They can't deliver on any of those things, principally because they can't keep staff.

Telling him how to spend his time (work on the game, not the animations) requires way too many assumptions on our part.

No it doesn't. It's valid customer feedback: "Squad, work on the game, not on marketing fluff." Totally valid customer feedback. If Squad employees or forum moderators (or you, for that matter) get their widdle feewings hurt when they hear that, that's their problem. Business is not the place for the thin-skinned.