Later Hanafi commentary, including Radd al-Muhtar, describes stopping at Muhassab as a Sunnah practice, even if the stop is brief. This is not the same legal classification as the following obligatory farewell tawaf.
Failure to make a stop at this site does not, by itself, mean the farewell circumambulation was omitted. Al-Quduri describes the actual tawaf in the next clause.