Board Thread:General Discussion/@comment-4440927-20150410030856/@comment-24152851-20150420125230

Yeah Blaze is right. The games invent all sorts of new plots to fit the gameplay which will not be acknowledged at all in the series.

In any case, as terrible as DBGT is, it is definitely in the same universe and continuity. A lot of fans don't disregard it as non-canon, but choose to ignore it's existence and feel the series ended at DBZ.