The K Flodin morning worship talk being referred to is here.
https://tv.jw.org/#en/mediaitems/pub-jwbmw_201511_3_VIDEO
He mentions the speculative year of 2040 (around the 5.10 mark) and with all his double talk, is trying to infer that the GT will come before then.
The other speculative year of 2034 comes from 1914 plus 120 years (relating to the time of Noah) to get to 2034.
This doesn't answer ttdtt's question.