skribs
Grandmaster
There were/are different ways to perform Taeguk forms.
I kept up with little changes KKW made over the years.
But circa maybe like 2009 you would've never seen someone perform the Taeguk forms as they are performed today.
The sport poomsae overhaul totally revamped the forms for competition, but there are still many ways to train the forms.
I like sport poomsae, but I wouldn't consider there to be one official, correct way to train the forms.
There's just one correct way to do it if you want to win gold.
The videos I've seen range from being very recent (last couple of years), to old (posted to youtube back when 360p was the highest resolution available), to really old (posted on what looks like a home camcorder from the 80s or 90s in terms of quality).
Sport poomsae guidelines are just modern competition standards.
It's not Taekwondo gospel or something.
The videos I've watched have been for KKW, not World Taekwondo.