Sadly I don't think Disney does well at keeping their own WWOS website up, been this way for YEARS even when my over 30 kids were competing in HS AND ....
.... JMO but I think Disney knows folks check the site for competitions and Cheer/Dance are often perceived as negatively impacting hotels/guests, so easy enough to just leave off. They stay values and moderates. I mean the groups going have all the information and these aren't open to any group to sign up, so no real need to list.
AND the list you have is not even all of them, add ~
Cheer Worlds UCA/UDA ALL Star National March 8-9, 2025
Dance Classic April 4-6, 2025
Crystal Dance Classic April 11-13, 2025
Cheerleading Worlds 2025 April 25-28, 2025
Dance Summit May 2-4, 2025
Dance the World June 28-July 2, 2025
Summer Dance Classic July 10-13, 2025
World Dance July 9-14, 2025
AND probably more ... as there are quite a few that are hosted at local venues (not WWOS) but still stay at Disney and get group park tickets.