It doesn’t look like a H. Nemurus.
However the Hemibagrus group contains a number of other large cats all which could conceivably be available albino if one is lucky enough.
I think that the LFS is going on the colour of the tail, with the white top and bottom. Unfortunately the Wyckioides also has these colour differences when smaller, albeit not always white, but would they appear white in an albino form? I don’t know as have never seen anyone selling a small albino Wyckioides, they have all been nemurus or similar smaller hemibagrus.
I too would be surprised an LFS getting an albino Wyckii but i would them getting an albino Wyckioides too.
If the price was right I would buy either an albino Wyckii or Wyckioides.
Can’t tell for sure which this is.