"I don’t mention Common Lisp here because, again I stress personally, I hope we stop encouraging it’s active use."

Keep hoping.

"I consider [Common Lisp] [...] over-engineered for almost any other scenario."

Pretty broad claim, in what way is CL over-engineered and for what particular scenarios? And how does that justify discouraging its use?

Sounds like someone is looking for excuses not to get busy learning a language in depth... Seriously, if you don't feel like learning a language, fine. But don't criticize that which you only understand the basics of.