Comment by pegasus

I think we can safely overload the term since the domains are separated enough. No one will think you're referring to quantum states when complaining that the system has been decohering too much lately. I can see why the author choose the term: "decohere" is a verb, which is fitting since it denotes a process, something that happens to systems gradually as change accumulates. There's no such connotation and associated verb to "incoherence".