Student or Learner
as ...as= the same
Mary and Wendy are attractive to the same degree, we say:
Mary is as attractive as Wendy.
Does "isn't as tall as" mean simply not the same,or does it mean the second one is taller.
"Tom isn't as tall as Paul" does it have the same meaning as "Paul isn't as tall as Tom" or do they have opposite meanings (in the first one Paul is taller whereas in the second one Tom is taller).
It means that Paul is taller than Tom (1) and Tom is taller than Paul (2).
I'm sure that you could find someone who would argue the point, f.ex.
"Tom isn't as tall as Paul. Tom is taller than Paul", but in your sentences it means as I explained above.
Hope it helps.