devtrackers.gg
The new dragons, giants and demons were from one graphical update in 2007, when they began moving towards HD (which released a year later). No one considers post-HD as old school and neither should those models. Their presence doesn't negate the fact that most of the mobs (and 100% of the game environment) were still using the older style/gourad shading in 2007. Basically those new dragon/demon/etc models are the least old school thing out of everything that could be considered old school; it's only because they were released in the last "old school" year that they are considered as such.