He is a quote unquote expert, but he knows nothing.
quote unquote
idiomEmphasizes the following (or sometimes preceding) word or phrase for irony, or marks it as not the normal sense of the term.
Origin
disputed originFrom quote + unquote, a spoken equivalent of air quotes, used to express satire, sarcasm, irony or euphemism, analogous to scare quotes in print.
My boss calls this a mandatory meeting, but it is quote unquote optional for everyone.
The politician promised a quote unquote transparent process, yet the public remains excluded from every major decision.