He was not impeached and disbarred for having an affair. He was impeached and disbarred for lying about the affair while testifying under oath in a court proceeding. It is amazing how many people do not understand this.
His quote does not imply causality merely a partial list of things Clinton has done that are to his discredit.
‘Impeached for having sex with an intern’.
People just don’t want to understand. If they did, then things would be clear.