If you consider "animation delayed" the spell taking its full effect from start of animation cast to end of animation cast (to spell landing and taking effect) then yes, the animation is delayed.
I will try to record another one with the chat next time, but you'd see the same thing: it's not just the effect that gets delayed, but also the chat displaying it.

Here's another video of me buffing myself up with a low lvl magician (chat included):

https://youtu.be/dnHxICp-l6U

As you can see from the first two casts, if I sit down at the end of the animation's full cycle the spell is aborted (while it should supposedly be having its effect already), same applies if I move.
Biggest delay: 3rd cast (self AF buff) @ minute 0:16, where the delay is 7 (!!!) secs long.

If you need another video with damage spells let me know.

Possibly unrelated, but I have seen similar behavior with crafting. The progress bar is at 100% but I still need to wait a few seconds before the craft finishes.