The ST was not designed for "forcing battalion into retreat" it was designed fire support vs enemy strong position or in urban terrain.
As you can see in wikipedia though there at least one record of "wiping entire platoons":
"During this action, one of the Sturmtigers in Sturmmörserkompanie 1001 near Düren and Euskirchen allegedly hit a group of stationary Sherman tanks in a village with a 380mm round, resulting in nearly all the Shermans being put out of action, and their crews killed or wounded. This is the only tank-on-tank combat a Sturmtiger is ever recorded engaging in."
Lets be generous and drop the word allegedly for this record. To call the units combat history successful was again a large adventure in fiction. One alleged combat venture a success record or combat legend does not make. Hence the very discussion on how a units life was blown up into historical fiction, very generous treatment considering they had to record the one time it hit something that wasn't a city albeit allegedly.
Also in the sentence above it does mention a company of 7 sturmtigers failing to hit Remagen bridge, if that may lend an ear to the luck or legitimacy of the alleged hit. Again a generous fiction to make it as accurate and powerful as it is when it was likely luck or perhaps didn't occur.
Note : The Wiki for the Sherman company hit still needs citation on Wiki, hence has no written record provided on the Wiki.