This has to be a bug. There is no way that a tow cable retention bracket is stopping anything, let alone having an effective armor rating between 1000mm-1600mm thickness. I don’t understand how this is even a possibility.
You can bug report it here (just search a bit first so that you don’t report something that is already reported and known about): (Gaijin.net // Issues)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)