The premise of the title is a bit odd, because technically anything a lisp can do assembly language can do. The bar on being able to do 'anything' is so low that many things accidentally become Turing complete.
Can lisp programmers still feel smug about using lisp? No, because it never was and never will be productive to feel smug.
Is lisp still the best language for expressing a programmers thoughts? Yes, because it has basically no syntax, so any program will be a direct representation of a programmer's mental model for how their program works. No language with syntax will do that, but the average programmer is probably best actively discouraged from utilising this freedom because they probably have flawed mental models of what is going on.
Can lisp programmers still feel smug about using lisp? No, because it never was and never will be productive to feel smug.
Is lisp still the best language for expressing a programmers thoughts? Yes, because it has basically no syntax, so any program will be a direct representation of a programmer's mental model for how their program works. No language with syntax will do that, but the average programmer is probably best actively discouraged from utilising this freedom because they probably have flawed mental models of what is going on.