Hello Zac,
The KB article only takes care of removing the schedule tasks from the NS. The SQL changes is needed because if you only delete the task from '%windir%\tasks' it gets recreated by the weekly schedule task.
Now, before you run any truncation, the big question is: do you need any of the data in the table?
If the answer is no, go ahead and truncate it.
If not, you'll want to delete large chunks of it without running SQL that will take forever (check if there's an index on the table that can be used, like a modified date or positional value).
Let us know if you need more details on either case!