Commenting on
It was reported (I could not confirm the source though) that Yoda Norimoto also spoke highly of this move.
On the other hand, commenting at Yikeweiqi, Chinese professional Yang Dong 4-dan said (also my translation): B55 (R9) is a clueless move. At this moment, either crawling at S11 or enclosing at P10 are more viable solutions. For a girl under 10, B55 is probably not considered a serious error. However, if measuring using professional standard, this move is completely inadequate.
AI appears to support the Chinese view (see viewtopic.php?p=240866#p240866 showing a 10% drop of winning rate for black).