"Thick" already has a meaning of "dimwitted" so it's a particularly strange choice of word in this context. Is this something this new use of "thick" as a synon

"Thick" already has a meaning of "dimwitted" so it's a particularly strange choice of word in this context. Is this something this new use of "thick" as a synonym for "deep" something this author is trying to coin, or is this already an established meaning among younger generations?