> encumbered by mainstream language syntax and development procedures which introduce an extraordinary volume of unnecessary complexity at many levels.
This clearly states about Clojure that its syntax AND it's procedure of development (another grand claim) introduce said complexity.
That whole write-up is just about as incorrect as it can get:
> Virtually every other well known development tool in popular use is built upon bloated layers of existing technology, [...] Most developers have just never experienced the sort of self dependent architecture,
Never mind that Red is actually implemented in another abandoned proprietary language[0]!
That entire sales pitch is a barefaced lie.