I've never heard of that date, Jerome. But maybe some of our more senior or long time members may have heard of it?The only thing related to Watchtower and 1954 that I could find was the Douglas Walsh trial in Scotland, where Fred Franz was found to be unable to translate a Bible verse into Hebrew.
However I don't trust David Splane and I wouldn't put it past him to either arrogantly get the date wrong, but refuse to correct it, or use a false date to throw people off.