Reading databases of sports data
Just a few thoughts...


Instead of using data tables and data sets I would try to go with POCO and a data reader. This is definitely more linq friendly. Perhaps even faster to load.
You could try to load the tables in parallel - I doubt a single table brings the SSD to its limits.
All SQLite objects need to be disposed.
Your naming conventions is in great need of improvement - lots of abbreviations and mixed case.
The return true isn't necessary. The method never returns a false anyway. It might as well be just void.