Aberrant Mind Sorcerers get Psionic Sorcery at L6:
When you cast any spell of 1st level or higher from your Psionic Spells feature, you can cast it by expending a spell slot as normal or by spending a number of sorcery points equal to the spell’s level. If you cast the spell using sorcery points, it requires no verbal or somatic components, and it requires no material components, unless they are consumed by the spell.
Can you cast these spells at a higher level, using more sorcery points? I.e., cast Arms of Hadar at L2 using 2 sorcery points?