Either the blacklist to stop tech dungeons spawning is not working or I can't figure out the syntax. I've tried

A blacklist to stop tec dungeon spawn in dimensions. [default:[0]]

I:bl_tec_dungeons <
0,1,-1,7
 >

and

A blacklist to stop tec dungeon spawn in dimensions. [default:[0]]

I:bl_tec_dungeons <
[0,1,-1,7]
 >

and

A blacklist to stop tec dungeon spawn in dimensions. [default:[0]]

I:bl_tec_dungeons <
[0,
      1,
    -1,
    7]
 >

and the dungeons keep spawning in dimension 7 (Twilight Forest):

Worked like a charm. Suggest adding 2 dimensions to the example in the config for other people.

The syntax is:

I:bl_tec_dungeons <
    0
    1
    -1
    7
 >

(Its a forge feature dont ask me why the formatting is so weird.)