I didn't check the mod for function, However I can help with why it's not showing.
You need to define your submenu since you're making a new 'tag'
[SUBMENU_START:Baitseeking]
Blah Blah
[SUBMENU_END:Baitseeking]
Either open menudef_additional.txt and add a new line:
.Baitseeking. -1- *MAKE*
Or Make a new menudef_name.txt file and add the line above.
Or change the tag to an already embedded tag making your mod show in that menu;
[SUBMENU_START:fishing]
blah blah
[SUBMENU_END:fishing]