Usage of supportsTransactionalUndo() was removed from ZODB in 2007 - see e.g. the following commits:

https://github.com/zopefoundation/ZODB/commit/a06bfc03 https://github.com/zopefoundation/ZODB/commit/e667b022 https://github.com/zopefoundation/ZODB/commit/f595f7e7 ...