Hello everyone,
Sorry for the confusion here! I have got to be more careful when I answer a post, so that I use the most precise language possible! This mix-up is my fault, because of a poor choice of words I used.
Assuming I understand the question correctly: Is an attack spell an attack? Answer: No. It is a spell, the resolution of which provides an attack.
An attack spell starts out as a spell, like any other spell. It has a Cast Spell Step and a Counter Spell Step. When (and if) it gets to the Resolve Spell Step an attack begins.
This attack is like any other attack, except a few pieces of information have already been decided for the "Declare Attack Step". For example, when you cast the spell, you have already checked range and LoS, declared targets, made yourself the source for the attack, and paid some costs.
I hope this helps.
Bryan