I see no reason for that to happen. If a mystic can cast fireball without needing VSM, it can cast fireball , and its a spell. There is no reason to say that its a non-magical fireball. Seems a really clean and easy to handle rule without any need for checking the details of spells or disciplines during game play. But that's just me. If they ever did create a discipline which replicates a spell, I would expect the errata to clarify that they cast the spell, or they clarify what the difference between the spell and the discipline are.
I guess we'll just have to agree to disagree.
It still seems arbitrary to me, plus I don't like how it'll perforce split psionics into "magic" spells and "nonmagic" powers.
If such a rule were applied to 3E, the psionic power
read thoughts would not be "magic", since it doesn't quote the wizard's
detect thoughts spell, while in AD&D both abilities were the same, being the
ESP spell/power (unless my memory deceives me).
Similarly, the 3E
psionic teleport would be "magic", since the description says it works like the
teleport spell, while
psionic restoration is not, since the description is a copy of what
restoration does instead of a "works like it" quote. There's no real reason as to why the former's "magic" and the latter isn't. I don't mind some arbitrariness with magic spells, but it just feels wrong to me for psionics, since I think of them more as "mental science". There just doesn't seem to be any solid reason for the difference. (Unless there isn't any logic behind it? Maybe the insane physics of the Far Realms are influencing the psionic rules…

).
It also retains one of my other objections to that approach - whenever a psionic power interacts with
dispel magic or whatever you have to check whether the power works like a spell, either by looking them up or memorizing which ones are spells.
Obviously, there are ways around this. A simple solution would be to use a particular prefix to the name of every power that works like a spell, so the gamers will always know
psionic disintegrate can be dispelled and works like
disintegrate. Just be careful not to have any that aren't "magic", like the 3E
psionic disintegrate which copies most of the spell description instead of saying "works like
disintegrate".