Morkus from Orkus
It's not that I don't get how you're moving from A to B, I do, I just don't agree with you about what it means. Right now there are no spell-like psionic abilities that are separate from the casting rules. Every full caster psion ever designed for D&D has had access to a host of spells, or spell-like abilities if you prefer. So the Sorcerer in question is our only example of what a full-caster psion would look like in 5E, at least at this point in the design cycle. There's no other evidence of anything for what a full class Psion might look like, other than that it would use the psionic die mechanic.
Except that the Sorcerer in question isn't an example of what a full-caster Psion would look like. It's an example of what an arcane caster who has a bit of psionics to modify his arcane magic would look like.
You seem to be under the mistaken impression that evidence has to show definitive proof of something. Your presence at a night club during the time of a shooting is evidence that you could be the shooter. It's not strong evidence by itself, but it is evidence, even if you are not the shooter.Just because the psionic die sometimes removes the need for the usual trapping of arcane casting is evidence neither that a 'full psion' class would completely remove those requirements, nor that that class would somehow be created outside the current spellcasting rules.
The Psionic Soul power is evidence that psionics won't require components. It's just not absolute proof. Even the Mystic is evidence, even though it has been discarded, as it shows the thinking of WotC. 3e and 4e are similarly evidence. The lack of a single psionic power in the new UA requiring components is also evidence.
Taken in its totality, all that evidence is enough to convince me that a Psion, should it ever be made, won't need components for its powers.